Spence, Nicol C.W.
Wilhelm Fink Verlag , 1976
Buku Teks SO
Omar, Asmah binti Haji
Dewan Bahasa dan Pustaka. Kementerian Pelajaran Malaysia, 1975
Buku Teks SO
edited by Archibald A. Hill
Basic Books, 1969
Buku Teks SO
edited by Eric P. Hamp, Fred W. Householder, Robert Austerlitz
University of Chicago Press, 1966
Buku Referensi
Corder, Stephen Pit
Penguin Books , 1973
Buku Teks SO