Gallagher, Matthew P.
Frederick A. Preager, 1963
Buku Teks
McCauley, Martin
Longman, 1993
Buku Teks
The University of Chicago Press, 1983
Buku Teks
Frederick A, Praeger; George Allen and Unwin Ltd., 1964
Buku Teks
Pokshishevsky, V.
Progress, 1974
Buku Teks