Purdy, Al, author

McClelland and Stewart, 1978

 Buku Teks

written by the participants in the National Student Symposium on the Education of the Gifted and Talented ; Mark L. Krueger, project director ; sponsored by the American Association for Gifted Children

Walker, 1978

 Buku Teks

Campbell, Marion, author

Fremantle Arts Centre Press, 1988

 Buku Teks

Bradley, Ben, author

Wiley, 2015

 Buku Teks

Heidegger, Martin, author

State University of New York Press, 1996

 Buku Teks