Fabella, Armand V.
University of the Philippines, 1968
Buku Teks
Golay, Frank H.
Cornell University Press, 1961
Buku Teks
Mears, Leon A.
University of the Philippines Press, 1969
Buku Teks
Kunio, Yoshihara, author
Oxford University Press, 1994
Buku Teks
Boulding, Kenneth E. (Kenneth Ewart), 1910-1993, author
Prentice-Hall, 1958
Buku Teks