Fryer, D.W.
McGraw-Hill, 1965
Buku Teks SO
PWN-Polish Scientiic Publishers, 1968
Buku Teks
edited by Ralph Landau, Timothy Taylor and Gavin Wright
Stanford University Press, 1996
Buku Teks SO
Tinbergen, Jan, 1903-
McGraw-Hill, 1967
Buku Teks
The University of Chicago Press, 1977
Buku Teks