McLemore, S Dale
Allyn and Bacon, 1983
Buku Teks
Jaret, Charles
Harper Collins College Publishers, 1995
Buku Teks
Rose, Peter I., foreword
Random House, 1964
Buku Teks
Schaefer, Richard T, author
Pearson Education, 2015
Buku Teks
Parrillo, Vincent N., author
Pearson, 2014
Buku Teks