Wilcox, Walter W., author
Prentice-Hall, 1951
Buku Teks
Martin, Anne
Routledger Kegan Paul , 1958
Buku Teks
Hubbard, Leonard E., author
MacMillan, 1939
Buku Teks
Davies, J. Kenneth, 1925-, author
J.B. Lippincott, 1970
Buku Teks
edited by Burton A. Weisbrod
Prentice-Hall, 1965
Buku Teks