Charles W. Eliot, edited
P. F. Collier & Son Corporation, 1959
Buku Referensi
Hardy, Thomas, 1840-1928, author
Harper & Brothers, 1922.
Buku Teks
Gerindo Joyo Negoro, author
2015
UI - Tesis Membership
Muhammad Iqbal Ramadhan, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2019
UI - Makalah dan Kertas Kerja
Bhawika Sukma Pinesti, author
Fakultas Teknik Universitas Indonesia, 2014
UI - Skripsi Membership