Dube, Yves, author
Queen's Printer, 1957
Buku Teks
Siburian, Andor Kevin Nathaniel, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2022
UI - Skripsi (Membership)
Dwyer, Denis John, author
Longman, 1979
Buku Teks
Colombijn, Freek, author
KITLV Press, 2010
Buku Teks
Farah febrina, author
Fakultas Teknik Universitas Indonesia, 2023
UI - Skripsi Membership