Agar, Michael H.
Academic Press, 1980
Buku Teks
Shinn, George, author
McGraw-Hill, 1982
Buku Teks
Loeffler, Agnes G., author
Jones & Bartlett Learning, 2015
Buku Teks
Vaczek, Louis, author
The Viking Press, 1964
Buku Teks
Copi, Irving M., author
Prentice-Hall, 1995
Buku Teks