Bradford, Richard, 1957-, author
Wiley Balckwell, 2015
Buku Teks
Doren, Mark van, author
Doubleday , 1955
Buku Teks
Cambridge University Press, 1973
Buku Teks
Goode, Richard
John Wiley & Sons, 1951
Buku Teks
edited by Edward B. Esphansade, Joel L. Morrison
Rand McNally & Co, 1966-1978
Buku Referensi