Everett, D.H.
Longmans, 1954
Buku Teks
Lakhanpal, M.L., author
Tata McGraw-Hill, 1983
Buku Teks
Pandey, G.N., author
Khanna Publisher, 1980
Buku Teks
Daubert, Thomas E., author
McGraw-Hill Company, 1985
Buku Teks
Smith, J. M., author
McGraw-Hill, 1981
Buku Teks