Rebecca Soselisa, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2012
UI - Skripsi Open
edited by William Ellet
Harvard Business School Publishing, 1997
Buku Referensi
Wright, Andrew, 1937-, author
Cambridge University Press , 1989
Buku Teks
Mouton Publishers, 1975
Buku Teks
Lonergan, Jack, author
Cambridge University Press , 1994
Buku Teks