Allee, W.C., author
John Wiley & Sons, 1963
Buku Teks
Macfadyen, A.
Pitman Publishing Corporation, 1963
Buku Teks
Pandey, B.N., author
Tata McGraw-Hill, 2012
Buku Teks
Peters, Robert Henry
Cambridge University Press, 1983
Buku Teks
edited by Ian R. Swingland and Paul J. Greenwood
Clarendon Press, 1983
Buku Teks