Scott-Kilvert, Ian
Longmans, Green, 1970
Buku Teks
Harrower, Elizabeth, 1928-
Angus & Robertson, 1966
Buku Teks
Merriam-Webster's, Incorporated, 1993
Buku Referensi
Springfield, Massacuset : G.& C. Merriam Co., Publishers, 1948.
Buku Teks
Merriam-Webster, Inc., 1988
Buku Teks