Kokusai Bunka Shinokai, 1972
Buku Referensi
The INternational Society for Educational Information,, 1992.
Buku Teks
Ball, J. Dyer
Kelly & Walsh, Limited, 1925
Buku Teks
Rani Wahyuningtyas
2017
UI - Skripsi (Membership)
Azrina Nadira
2016
UI - Skripsi (Membership)