Spector, Ivar
Van Nostrand Reinhold, 1949
Buku Teks
Rothstein, Andrew, author
Penguin Books , 1950
Buku Teks
Riasanovsky, Nicholas V., author
Oxford University Press, 1963
Buku Teks
edited by Harry Daniels
Routledge, 2005
Buku Teks
Garder, Michel
Frederick A. Praeger, 1966
Buku Teks