Maxwell, A.E., author
Chapman & Hall, 1983
Buku Teks
Kuzma, Jan W., author
Mayfield Publ., 1984
Buku Teks
Peacock, Janet L., auhtor
Oxford University Press, 2007
Buku Teks
Petrie, Aviva
Blackwell Scientific Pub., 1984
Buku Teks
Blalock, Hubert M., author
McGraw-Hill , 1981
Buku Teks