Tinbergen, Jan, 1903-
McGraw-Hill, 1967
Buku Teks
Fryer, D.W.
McGraw-Hill, 1965
Buku Teks SO
edited by Ralph Landau, Timothy Taylor and Gavin Wright
Stanford University Press, 1996
Buku Teks SO
The The University of Chicago
The University of Chicago Press, 1972
Buku Teks SO
Saeed, Khalid
Avebury, 1994
Buku Teks