Ferraro, Gary P., author
Wadsworth, 2016
Buku Teks
edited by Robert Hunt
Natural History Press, 1967
Buku Teks
Barnard, Alan, author
Cambridge University Press, 2000
Buku Teks
Tavistock Publications, 1968
Buku Teks
Hymes, Dell H., author
Amsterdam John Benjamins 1983
Buku Teks