Renner, John W., author
Harper & Row, 1968
Buku Teks
Victor, Edward, author
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