Porter, Hal
Thomas Nelson and Sons, 1974
Koleksi Publik
Elliott, Brian, author
Nelson , 1970
Buku Teks
Penguin Books, 1989
Buku Teks
Zwicky, Fay
University of Queensland Press, 1982
Buku Teks
Stewart, Douglas, author
Angus and Roberson Publishers, 1962
Buku Teks