Sarason, Seymour B.
Harper & Row , 1959
Buku Teks
Ullmann, Leonard P.
Prentice-Hall, 1975
Buku Teks
Page, James Daniel
Tata McGraw-Hill, 1994
Buku Teks
Halgin, Richard P.
Harcourt Brace Jovanovich College, 1993
Buku Teks
Bartol, Curt R.
Pearson Education, Inc., 2008
Buku Teks