Rae, Wesley D.
Twayne, 1967
Buku Teks
Clark, Thomas D., editor
Oxford University Press, 1961
Buku Teks SO
Thomas, Kenneth D.
[publisher not identified], [date of publication not identified]
Buku Klasik
Thomas D.Brock, Michael T. Madigan
Pearson Benjamin Cummings, 2009
Buku Teks
Madigan, Michael T., 1949-
Pearson Education Limited, 2015
Buku Teks