MacStravic, Robin E.
Aspen Publication, 1980
Buku Teks
Reinhard Busse, Alexander Geissler, Wilm Quentin, Miriam Wiley
McGraw-Hill, 2011
Buku Teks
Oxford University Press, 1978
Buku Teks
edited by John H. Bryant ... [et al.]
Ballinger, 1976
Buku Teks
Godfrey, M.G.
Edward Arnold , 1986
Buku Teks