Siagian, Diyana Theresia Berlian, author
2013
UI - Skripsi (Membership)
1982,
Buku Teks
Musselman, Vernon A., author
Prentice-Hal , 1969
Buku Teks
Lani Sidharta, author
Elex Media Komputindo, 1996
Buku Teks
Sitompul, Yosef Parlindungan, author
2013
UI - Tesis (Membership)