Beer, Francis A
Halt, Rinehart, 1970
Buku Teks
Rosenberg, Jerry M.
John Wiley & Sons, 1987
Buku Referensi
Harries, Steve
Library Assocantion Publishing, 1993
Buku Teks SO
Raieli, Roberto
Chandos, 2013
eBooks
Heldman, Robert K.
McGraw-Hill, 1993
Buku Teks SO