Daniel, Hawthorne, author
G.P. Putnam's Sons , 1943
Buku Teks
Oliver, Douglas L., author
Harvard University Press, 1951
Buku Teks
Oliver, Douglas L., author
Harvard University Press, 1958.
Buku Teks
Campbell, I. C., author
University of Queensland Press, 1989
Buku Teks
edited by Norman and Ngaire Douglas
Angus & Robertson, 1989
Buku Referensi