Oliveira, A. Ramos
Victor Gollancz Ltd., 1946
Buku Teks
Davison, Frank Dalby, 1983-1970, author
Angus and Robertson, 1973
Buku Teks
Bagdikian, Ben H.
Harper & Row Publishers, 1971
Buku Teks
Alcott, Louisa May, 1832-1888, author
Gramedia Pustaka Utama, 2015
Buku Teks
Bradshaw, Thornton F.
Harvard University,, 1950
Buku Teks