Grove, Richard H.
Cambridge University Press , 1996
Buku Teks
edited by Robert Paehlke
Fitzroy Dearborn Publishers, 1995
Buku Referensi
de Freitas, Chris R.
Springer, 2012
eBooks
Bloomsbury Academic, 2014
Buku Teks
Milton, Kay
Routledge, 1996
Buku Teks