Gordon M. Barrow ... [et.al.]
W.A. Benjamin, 1967
Buku Teks
Suchocki, John
Pearson Benjamin Cummings, 2007
Buku Teks
Sackheim, George I.
Macmillan, 1973
Buku Teks
Bodner, George M.
John Wiley & Sons, 1995
Buku Teks
Timberlake, Karen C.
Prentice-Hall, 2007
Buku Teks