Cook, David I.
International Textbook Company, 1961
Buku Teks SO
Housner, George W.
D. Van Nostrand , 1959
Buku Teks SO
Singer, Ferdinand L.
New York: Harper and Row, 1975
Buku Teks
Meriam, James L.
John Wiley & Sons, 1978
Buku Teks SO
Meriam, James L.
John Wiley & Sons, 1959
Buku Teks SO