Agricultural ecology
Buku Teks
Tivy, Joy
Agricultural ecology
Longman Scientific & Technical, 1992
Buku Teks
Singh, Jasbir
Agricultural geography
Tata McGraw-Hill, 1984
Buku Teks
Malott, Deane W.
The Agricultural industries
McGraw-Hill, 1939
Buku Teks
Ross, Robert C.
An introduction to agricultural economics
McGraw-Hill, 1951
Buku Teks