Hudson, Alastair
Sweet and Maxwell, 2008
Buku Teks
edited by Karl-Eduard von der Heydt and Stanley Keller
Graham & Trotman, 1995
Buku Teks
edited by Ernest L. Folk
Sage Hill, 1971
Buku Teks
Hazen, Thomas Lee
West Publishing, 1996
Buku Teks
editoed by Karl-Eduard von der Heydt, Stanley Keller
Graham & Trotman / Martinus Nijhoff, 1995
Buku Referensi