Elonka, Stephen Michael
[publisher not identified], [date of publication not identified]
Buku Referensi
Arora, C. P.
Tata McGraw-Hill, 1981
Buku Teks
Ballaney, P. L.
Khanna, 1983
Buku Teks
Hazra, B.
Dhanpat Rai and Sons, 1980
Buku Teks
Stoecker, Wilbert Frederick
McGraw-Hill, 1982
Buku Teks