Campbell, John C.
Frederick A. Preger, 1960
Buku Teks
Hadar, Leon T.
Leon Hadar, 2005
Buku Teks
Alexander R. Dawoody, editor
Springer, 2015
Buku Teks
Morrison, Stanley Andrew
SCM Press, 1954
Buku Teks
edited by Shireen Hunter ; foreword by Robert G. Neumann and G. Henry M. Schuler
Westview Press, 1985
Buku Teks