Keller, Edward A., author
John Wiley & Sons, 2014
eBooks
Keller, Edward A., author
Universitas Indonesia, 2011
Buku Referensi
Simmers, Louise M., author
Delmar Cengage Learning, 2009
Buku Teks
Boy S. Sabarguna
UI-Press, 2011
Buku Teks
Sage Publications , 2018
Majalah, Jurnal, Buletin