Zwicky, Fay
University of Queensland Press, 1982
Buku Teks
Higham, Charles, author
Angus & Robertson, 1970
Buku Teks
edited by Selden Rodman
Mentor Book , 1960
Buku Teks
Musgrave, Susan
Sono Nis Press, 1977
Buku Teks
Hardy, Thomas, 1840-1928, author
Rybun Publishing, 1995
Buku Teks