Eldershaw, M. Barnard.
Harcourt, Brace and company, 1929
Buku Teks
Guareschi, Giovanni, author
Farrar, Straus & Young, 1953
Buku Teks
Blueprint, 1992
Buku Referensi
Findlay, Bruce Allyn, author
Stanford University Press, 1952
Buku Teks
Findlay, Bruce Allyn, author
Stanford University Press, 1959
Buku Teks