Hildebrand, Francis Begnaud
Prentice Hall of India, 1977
Buku Teks
Dixon, Charles
John Wiley & Sons, 1981
Buku Teks
Buck, R. Creighton
McGraw-Hill , 1978
Buku Teks
Buck, R. Creighton
McGraw-Hill, 1965
Buku Teks
Kaplan, Wilfred
Addison-Wesley, 1963
Buku Teks