Victor, Edward
Macmillan, 1966
Buku Teks
May, Lola June
The Free Press, 1970
Buku Teks
Blough, Glenn O.
Holt, Rinehart and Winston, 1964
Buku Teks
Sheffield, Linda Jensen
John Wiley & Sons, 2000
Buku Teks
Kean, John M.
St. Martin's Press , 1976
Buku Teks