Vance, Stanley C.
American industries
Prentice-Hall, 1955
Buku Teks
Tivy, Joy
Agricultural ecology
Longman Scientific & Technical, 1992
Buku Teks
Singh, Jasbir
Agricultural geography
Tata McGraw-Hill, 1984
Buku Teks
Agricultural ecology
Buku Teks
Austin, George T.
Shreve's chemical process industries
McGraw-Hill, c1986
Buku Teks SO