Ewing, J.H.
Dell Publishing, 1964
Buku Teks SO
Ambalu, Shulamit
Dorling Kindersley, 2013
Buku Referensi
edited by Stewart Sutherland, Leslie Houlden, Peter Clarke, Friedhelm Hardy
Routledge, 1988
Buku Referensi
edited by Donald S. Lopez
Princeton University Press, 1999
Buku Teks SO
Gaer, Joseph
Dodd, Mead, 1956
Buku Teks SO