Richardson, Elmo R., author
University of Kansas Press, 1960
Buku Teks
Pile, John F.
McGraw-Hil, 1997
Buku Teks
Herling, John
Robert B. Luce, Inc., 1964
Buku Teks
Ball, Victoria Kloss, author
John Wiley & Sons, 1980
Buku Teks
Overmyer, Grace
New York University Press 1957
Buku Teks