American Association for the Advancement of Science,, 1974
Buku Teks
Carrington, Selwyn H. H.
Foris Publications, 1988
Buku Teks
edited by Frank Freidel and Norman Pollack
Rand McNally, 1963
Buku Teks
Hacker, Louis M., author
Columbia University Press, 1947
Buku Teks
Hacker, Louis M., author
Columbia University Press, 1947.
Buku Teks