Strong, Anna Louise, author
New World Press, 1959
Buku Teks
Milivojevic, Dragoljub
Information Service, 1962
Buku Teks SO
Schwartz, Benjamin, author
Harvard University Press, 1952, 1961
Buku Teks
Schwartz, Benjamin, author
Harper Torchbooks and The Academy Library, 1967
Buku Teks
Goodrich, L. Carrington (Luther Carrington), 1894-, author
Harper and Brothers, 1943
Buku Teks