Golay, Frank H.
Cornell University Press, 1961
Buku Teks
Mears, Leon A.
University of the Philippines Press, 1969
Buku Teks
Kunio, Yoshihara
Oxford University Press, 1994
Buku Teks
Boulding, Kenneth Ewart, 1910-1993
Prentice-Hall, 1958
Buku Teks
Tinbergen, Jan, 1903-
North-Holland Publishing , 1952
Buku Teks