Glen E.Weston
Little,Brown and Company, 1971
Buku Teks
Oppenheim, S. Chesterfield
Little, Brown , 1971
Buku Teks
Oppenheim, S. Chesterfield
Little, Brown & Co., 1971
Buku Teks
McCormick, Charles T. (Charles Tilford), 1889-1963, author
Foundation Press, 1976
Buku Teks
McNair, Lord, author
University Press, 1956
Buku Teks