Guiltinan, Joseph P.
McGraw-Hill , 1982
Buku Teks
Blalock, Hubert M., author
Academic Press, 1975
Buku Teks
edited by M. David Ermann and Richard J. Lundman
Oxford University Press, 1978
Buku Teks
Herbert, Theodore T., author
Macmillan, 1976
Buku Teks
edited by Alfred Rappaport
Prentice-Hall, 1982
Buku Teks