Fabella, Armand V.
University of the Philippines, 1968
Buku Teks
Mears, Leon A.
University of the Philippines Press, 1969
Buku Teks
Kunio, Yoshihara
Oxford University Press, 1994
Buku Teks
Golay , Frank H.
Cornell University Press, [1969]
Buku Teks
Bello, Walden F.
Institute for Food and Development Policy, 1982
Buku Teks