Saeed, Khalid, author
Avebury, 1994
Buku Teks
Tinbergen, Jan, 1903-, author
McGraw-Hill, 1967
Buku Teks
PWN-Polish Scientiic Publishers, 1968
Buku Teks
edited by David F. Walker
John Wiley & Sons, 1980
Buku Teks
Fryer, D.W., author
McGraw-Hill, 1965
Buku Teks