Sitompul, Yosef Parlindungan, author
2013
UI - Tesis Membership
Kamaludin Akbar, author
[2016;2016;2016, 2016]
UI - Tugas Akhir
Musselman, Vernon A., author
Prentice-Hal , 1969
Buku Teks
Griffin, Ricky W., author
Pearson Education International, 2006
Buku Teks
Griffin, Ricky W., author
Prentice-Hall, 1999
Buku Teks