Sampson, Robert C.
McGraw-Hill , 1965
Buku Teks
Random House, 1969
Buku Teks
Sanford, Edward
Winthrop, 1977
Buku Teks
Berkhofer, Jr, Robert F
Collier MacMillan Limited , 1969
Buku Teks
by Harvey A. Horstein [and others]
Free Press a Division of Macmillan, 1971
Buku Teks