Edited by Cecilia Genereux, Paul D. Moeller
Libraries Unlimited, 2009
Buku Referensi
edited by Suzanne McMahon; Miriam Palm; Pam Dunn
The Haworth Press, Inc., 1991
Buku Teks
Afdeling Agrarische Geschiedenis, Landbouwhogeschool
Wageningen, 1985
Buku Teks
Bloomfield, B. C., author
Mansell, 1972
Buku Teks
Gore, Daniel, author
Greenwood Press, 1978
Buku Teks