Steinberg, David J. (David Joel), author
Solidaridad Publishing House, 1967
Buku Teks
Buchanan, Albert Russell, author
Harper & Row, 1964
Buku Teks
Gallagher, Matthew P., author
Frederick A. Preager, 1963
Buku Teks
edited by John Keegan
Routledge, 1995
Buku Teks
Buchanan, A. Russell, author
Harper & Row, [c1964]
Buku Teks