Powelson, John P., author
McGraw-Hill , 1964
Buku Teks
Manglapus, Raul S., author
Solidaridad Publishing House, 1967
Buku Teks
Lee, Phil, author
Sage, 1980
Buku Teks
Boulding, Kenneth E. (Kenneth Ewart), 1910-1993, author
Harper and Brother Publishers, 1953
Buku Teks
Reshetar, JR, John S.
Priceton University Press, 1952.
Buku Teks