1. ^{{citation|title=Notes from Millennium Beach|first=Bob|last=Young|publisher=Hope Publishing House|year=1999|isbn=978-0-932727-11-4|page=15|url=https://books.google.com/books?id=mFVusAKMQs4C&pg=PT15|quote=All who drew or painted with John Clapp at Art Center realized that a superstar would soon be launched. Not letting us down, John already has a fine reputation for painting stunning covers for juvenile books and has created illustrations for several children's books.}}
2. ^Faculty profile, SJSU School of Art & Design, retrieved 2012-04-30.
3. ^{{citation|title=Drawing From Life: The Journal as Art|first=Jennifer|last=New|publisher=Princeton Architectural Press|year=2005|isbn=978-1-56898-445-2|page=144|url=https://books.google.com/books?id=RCYS-rbPMDgC&pg=PA144}}.
4. ^{{citation|title=Celebrate the season with a good book|journal=The Dallas Morning News|last=Okamoto|first=Jennifer|date=April 17, 2002|url=http://www.highbeam.com/doc/1G1-84886379.html|archive-url=https://web.archive.org/web/20150329110028/http://www.highbeam.com/doc/1G1-84886379.html|dead-url=yes|archive-date=March 29, 2015|subscription=yes|quote=A moving fable about following your dreams with detailed, gorgeous watercolor illustrations.}}
5. ^{{citation|title=For Young Readers|journal=Washington Post|first=Elizabeth|last=Ward|date=September 8, 2002|url=http://www.highbeam.com/doc/1P2-383584.html|archive-url=https://web.archive.org/web/20150329110201/http://www.highbeam.com/doc/1P2-383584.html|dead-url=yes|archive-date=March 29, 2015|subscription=yes|quote=Clapp's paintings are striking}}.
6. ^{{citation|title=Children's Review: The Prince of Butterflies|journal=Publishers Weekly|date=March 18, 2002|url=http://www.publishersweekly.com/978-0-15-201454-4|quote=Clapp's (The Stone Fey) uncannily lifelike watercolors feature close-ups of butterflies and aerial shots.}}
7. ^{{citation|title=Children's Hour|journal=The Gazette (Colorado Springs)|first=Linda|last=DuVal|date=December 8, 2002|url=http://www.highbeam.com/doc/1P2-2733859.html|archive-url=https://web.archive.org/web/20141011213533/http://www.highbeam.com/doc/1P2-2733859.html|dead-url=yes|archive-date=October 11, 2014|subscription=yes|quote=sparely written and evocatively illustrated. ... The writer and illustrator work well together, and on some pages, the illustrations speak for themselves.}}
8. ^{{citation|title=Holiday tales: Children's books beautiful gifts from the heart Children's books|journal=Oakland Tribune|date=December 4, 2003|first=Kathleen Grant|last=Geib|url=http://www.highbeam.com/doc/1P2-6974434.html|archive-url=https://web.archive.org/web/20141007124718/http://www.highbeam.com/doc/1P2-6974434.html|dead-url=yes|archive-date=October 7, 2014|subscription=yes|quote=Clapp's lush paintings emphasize the characters' humanity and offer a wonderfully traditional Santa, who just happens to like bubble gum.}}
9. ^{{citation|title=The 12 Books of Christmas|last=Rust|first=Suzanne|journal=Black Issues Book Review|date=November 1, 2003|url=http://www.highbeam.com/doc/1P3-479110791.html|archive-url=https://web.archive.org/web/20141007184904/http://www.highbeam.com/doc/1P3-479110791.html|dead-url=yes|archive-date=October 7, 2014|subscription=yes|quote=John Clapp's hauntingly captivating illustrations are the perfect accompaniment.}}
10. ^{{citation|journal=Kirkus Reviews|title=Shining|url=https://www.kirkusreviews.com/book-reviews/julius-lester/shining/#review|date=October 1, 2003|quote=deep-eyed faces alive with character peer from Clapp’s sweeping, shadowy accompanying art}}.