Stehle, Philip
Harper & Row , 1971
Buku Teks
Griffiths, David J., author
Wiley-VCH, 2010
Buku Teks
by James A. Richards ... [et.al.]
Addison-Wesley, 1960
Buku Teks
Nelkon, Michael
Heinemann , 1995
Buku Teks
Valentin, Luc, author
North-Holland, 1981
Buku Teks