Openshaw, H.T.
Cambridge University Press, 1962
Buku Teks
Whitten, Kenneth W., author
Saunders College, 1992
Buku Teks
Feigl, Fritz, author
Elsevier, 1960
Buku Teks
Criddle, W.J.
John Wiley & Sons, 1990
Buku Teks
Kemp, William, author
McGraw-Hill, 1979
Buku Teks