Davidson, Lionel
Oxford University Press, 1980
Buku Teks SO
Davidson, Rob
Longman , 1993
Buku Teks
edited by Brian R. Walker; Nicki R. Colledge; Ian D. Penman; Stuart H. Ralston ; illustrator, Robert Britton
Churchill Livingstone/Elsevier, 2014
Buku Teks SO
Baum, Steven K
Cambridge University Press, 2008
Buku Teks SO
Wieringa, Saskia Eleonora, 1950-
Routledge, 2020
Buku Teks SO