Pratt Vernon
Methuen Press, 1978
Buku Teks
Ryan, Alan
Oxford , 1970
Buku Teks
edited by Norman MacKenzie
The New American Library, 1968
Buku Teks
edited by David A. Leeming, Kathryn Madden, Stanton Marlan
Springer, 2009
Buku Referensi
E. Julius Dasch, editor in chief
MacMillan Reference USA, 1996
Buku Referensi