Cohen, Nathan Edward, author
Holt, Rinehart and Winston, 1958
Buku Teks
Hogan, John D., author
Harper & Brothers, 1956
Buku Teks
Farley, John E., author
Prentice-Hall, 1987
Buku Teks
Grande, Sandy, 1964-, author
Rowman and Littlefield, 2015
Buku Teks
Hofstadter, Richard
George Braziller, 1959
Buku Teks