Frost, Lee, author
Amphoto Books, 2011
Buku Referensi
Greenburg, Steve, author
Alpha, 2002
Buku Referensi
Richard Mabey, editor
Penguin , 1991
Buku Referensi
Collins, V.D., author
J.B. Lippincott, 1935
Buku Teks
[research, writing, and illustrations, Charlie Wing ; editor Benjamin W. Allen]
Meredith Corporation, 1997
Buku Referensi