edited by Bernard Comrie
Routledge, 1991
Buku Referensi
Allen, Roy, author
Ian Allan, 1977
Buku Referensi
edited by Bernard Comrie
Oxford University Press, 1987
Buku Teks
Collinson, Diane, author
Routledge, 2006
Buku Teks
Kuther, Tara L., editor
Wadsworth and Cengage Learning, 2012
Buku Teks