Harris, Symour E.
MaGraw-Hill Book company Inc. , 1947
Buku Teks
Harris, Seymour E., editor
McGraw-Hill Book Co., 1947
Buku Teks
Appy, Christian G.
Penguin, 2016
Buku Teks
Barnett, Robert W.
Pergamon-Brasseys, 1984
Buku Teks
Wynot, Edward D.
University of Georgia Press, 1974
Buku Teks