Sitter, John, author
Cambridge University Press, 2011
eBooks
Spacks, Patricia Meyer, author
Wiley-Blackwell, 2009
Buku Teks
David Fairer, Christine Gerrard.
Wiley-Blackwell, 2015
Buku Teks
Falci, Eric, author
Cambridge University Press, 2015
Buku Teks
Anderson, M.S., author
Longman, 1971
Buku Teks