Rae, Wesley D.
Twayne, 1967
Buku Teks SO
Clark, Thomas D.
Oxford University Press, 1961
Buku Teks SO
Thomas, Kenneth D.
[Publisher not identified], [Date of publication not identified]
Buku Klasik
Michael T. MAdigan ...[et al]
Pearson Benjamin Cummings, 2009
Buku Teks SO
Thomas D.Brock, Michael T. Madigan
Pearson Benjamin Cummings, 2009
Buku Teks SO