edited by R.S.K. Barnes and K.H. Mann
Blackwell, 1991
Buku Teks
Rheinheimer, G.
John Wiley & Sons, 1980
Buku Teks
edited by A.P.M. Lockwood
Cambridge University Press, 1976
Buku Teks
Fassett, Norman C.
University of Wisconsin Press, 1985
Buku Referensi
Cowan, Marjorie Kelly
McGraw-Hill, 2012
Buku Teks