joseph, Cathy, author
A Roto Vision Book, 1999
Buku Referensi
Pare, Richard, author
Callaway Editions, 1982
Buku Teks
edited by Nathan Lyons
Prentice-Hall, 1966
Buku Teks
edited by Nathan Lyons
Prentice-Hall, 1966
Buku Teks
edited by J.A. Kraulis
Hurtig, 1980
Buku Teks