Gwartney, James D., author
The Reyden Press, 2000
Buku Teks
resources for the future, 1981
Buku Teks
Fatina Nidhia Septianie, author
Fakultas Psikologi Universitas Indonesia, 2019
UI - Tugas Akhir
Aisyah Nadia Fitriani, author
2018
UI - Skripsi (Membership)
Artikel Jurnal