Belshaw, Horace
Food and Agriculture Organization of the United Nations, 1959
Buku Teks
edited by J.R. Landon
Longman Scientific & Technical, 1984
Buku Referensi
University of Tokyo Press, 1969
Buku Teks
Lexington Books, 1983
Buku Teks
Groenewegen, Peter Diderik
George Allen and Unwin, 1985
Buku Teks