edited by William G. Eckert
Mosby, 1980
Buku Teks
Taupin, Jane Moira, author
CRC Press, 2011
Buku Teks
Wilson, Colin St John, author
Harper Collins, 1989
Buku Teks
Grover Maurice Godwin, editor
CRC press, 2001
Buku Teks
Hunter, John, author
Routledge, 2005
Buku Teks