edited by C. Grove Haines
John Hopkins Press, 1956
Buku Teks
Moore, Clark D
Praeger, 1968
Buku Teks
Moore, Clark D
Praeger, 1968
Buku Teks
Nielsen, Waldemar A., author
Atheneum, 1966
Buku Teks
Murdock, George Peter, author
McGraw-Hill, 1959
Buku Teks