Schoch, Richard W., author
Cambridge University Press , 2016
Buku Teks
Seeley, Christopher, author
University of Hawaii Press, 2000
Buku Teks
Kent, Sherman, author
Appleton Century Croffs, 1967
Buku Teks
Kent, Sherman, author
Appleton Century Croffs, 1941
Buku Teks
Larson, Laurence M., author
Holt , 1926
Buku Teks