Institute fo Scientific Information, 1981
Buku Referensi
Tillery, Bill W., author
McGraw-Hill, 2013
Buku Teks
Geoff Green, Ken Petford, Alan Short, David Walker
John Muray, 1975
Buku Referensi
Pomeroy, John H.
Holt, Rinehart and Winston, 1964
Buku Teks
Derry, Gregory N., author
Princeton University Press , 1999
Buku Teks