Lange, Norbert Adolph, author
McGraw-Hill, 1967
Buku Referensi
McGraw-Hill, 1973
Buku Referensi
edited by John A. Dean, Norbert Adolph Lange
McGraw-Hill, 1985
Buku Referensi
Lawrence, Eleanor
John Wiley & Sons, 1989
Buku Teks
Browning, Carl H., author
Oxford University Press, 1937
Buku Referensi