Gabriel, Ralph Henry, 1890-1987
D. Appleton-Century , 1942
Buku Teks
Greenwood Press, 1976
Buku Teks
Divine, Robert A.
Knopf, 1985
Buku Teks
American Association for the Advancement of Science,, 1974
Buku Teks
Baker, Robert H.
D. Van Nostrand, 1964
Buku Teks