Hall, Robert A.
Anchor Books, 1960
Buku Teks
edited by Valerie Kinsella
Cambridge Uniiversity Press , 1979
Buku Teks
Georgetown University Press, 1972
Buku Teks
Lado, Robert
University of Michigan, 1957
Buku Teks
edited by Eric P. Hamp, Fred W. Householder, Robert Austerlitz
University of Chicago Press, 1966
Buku Referensi