Dewey, Barbara I., author
Oryx Press, 1987
Buku Teks
McDonald, Mlcolm, author
John Wiley & Sons, 2011
Buku Teks
Elkin, A. P., author
Angus and Robertson, 1956
Buku Teks
Griffiths, Martin, author
Springer, 2012
eBooks
Elkin, A. P., author
Angus and Robertson, 1966
Buku Teks