Seidler, Lee J., author
[publisher not identified], 1975
Buku Teks
Harberger, Arnold C.
Macmillan, 1972
Buku Teks
Sickle, Clarence L. van, author
Prentice-Hall, 1955
Buku Teks
Anton, Hector R., author
Houghton Mifflin, 1978
Buku Teks
Nickerson, Clarence B., author
McGraw-Hill, 1962
Buku Teks