edited by H.V. Hodson
Longman, 1982
Buku Referensi
edited by H.V. Hodson
Longman, 1983
Buku Referensi
YEAR Incorporated, [date of publication not identified]
Buku Teks
School Government Publishing Co., 1987
Buku Referensi
Library of Conggress 1988, 1988
Buku Teks