Brandt, Conrad
George Allen and Unwin, 1959
Buku Teks SO
Brackman, Arnold C.
Frederic A. Preager, 1963
Buku Teks SO
Brackman, Arnold C.
Frederick A. Praeger , 1963
Buku Teks SO
Houn, Franklin W.
Prenrice-Hall , 1973
Buku Teks SO
edited by Geoffrey Parker
Cambridge University Press, 1995
Buku Referensi