Keyssar, Helene
Macmillan Press , 1972
Buku Teks
Shank, John
Prentice-Hall, 1981
Buku Teks
Csato, Edward
Interpress Publishers, 1968
Buku Teks
edited by Daniel Meyer-Dingrafe
Routledge, 2000
Buku Referensi
edited by Don Rubin, Peter Nagy and Philippe Rouyer
Routledge, 2001
Buku Referensi