Surina, Tugomir, author
Holt, Rinehart and Winston, 1964
Buku Teks
edited by Lloyd P. Hunter
McGraw-Hill, 1970
Buku Referensi
Milnes, A.G., author
Van Nostrand Reinhold, 1980
Buku Teks
Carroll, J.E., author
Cambridge University Press, 1990
Buku Teks
Romanowitz, H. Alex, author
John Wiley & Sons, 1962
Buku Teks