Weeks, John R. (John Robert), 1944-, author
Cengage Learning, 2016
Buku Teks
Otero, George G., author
University of Denver, 1981
Buku Teks
Gulati, P., author
Tata McGraw-Hill, 1984
Buku Teks
edited by John I. Clarke
Pergamon Press, 1984
Buku Teks
Russell, Sir E. John
George Allen and Unwin, 1961
Buku Teks