Tata McGraw-Hill , 1977
Buku Teks
Das, Arvind N.
Erasmus University, 1986
Buku Teks
Controller of Publications , 1976
Buku Teks
edited by S.P. Aiyar and R. Srinivasan
Allied-Publishers, 1965
Buku Teks
Davies, Cuthbert Collin, 1896-1974, author
Oxford University Press, 1959
Buku Teks