Darby, Michael R.
McGraw-Hill, 1976
Buku Teks
Gupta, Syamaprasad, author
The Johns Hopkins University Press, 1977
Buku Teks
Macmillan Press , 1976
Buku Teks
Metzler, Lloyd A.
W.W. Norton & Company Inc. , 1948
Buku Teks
edited by Max F. Millikan
Yale University Press, 1953
Buku Teks