Montgomery, Robert H., author
The Ronald Press, 1940
Buku Teks
by Philip L. Defliese ... [and others]
John Wiley & Sons, 1987
Buku Teks
Dahl, Curtis
Twayne , 1963
Buku Teks
Lenhart, Norman J.
The Ronald Press Company, 1957
Buku Teks
Davenport, Harold
Springer-Verlag , 1980
Buku Teks