Courtney, Thomas H.
McGraw-Hill, 2000
Buku Teks SO
edited by D.J. Weatherall, J.G.G. Ledingham, D.A. Warrell
Oxford University Press, 1987
Buku Teks SO
edited by A. Ghosh
E.J. Brill, 1990
Buku Referensi
Ostrowsky, O.
ELBS, 1981
Buku Teks SO
edited, B.J. Whiting .. .[et al.]
Harcourt, Brace & World, 1942
Buku Teks SO