Norton, George W.
McGraw-Hill, 1993
Buku Teks
Ross, Robert C.
McGraw-Hill, 1951
Buku Teks
Mellor, John W.
Cornell University Press, 1966
Buku Teks
Heady, Earl O.
Prentice-Hall, 1952
Buku Teks
Thomson, Edgar
Thomson Nelson and Sons Ltd. , 1949
Buku Teks