Whitman, Howard
Prentice-Hall, 1961
Buku Teks
Weiss, Joseph Douglas
Hopkinson and Blake, 1969
Buku Teks SO
edited by Charles Musselwhite
Emerald, 2018
eBooks
McInnis-Dittrich, Kathleen, author
Pearson Prentice Hall, 2013
Buku Teks
Roth, Philip.
Rinehart and Winston, 1974
Buku Teks