Hart, William L., author
W.C. Heath, 1963
Buku Teks
Lathrop, Thomas G., author
Wadsworth, 1965
Buku Teks
Rich, Barnett, author
McGraw-Hill, 1963
Buku Teks
Bowser, Edward A., author
D. Van Nostrand, 1893
Buku Teks
Thomson, J.E.
D Van Nostrand Co., 1962
Buku Teks