Fretwell, Elbert Kirtley, 1923-, author
Bureau of Publications, Teachers College, Columbia University, 1954
Buku Teks
The University of Chicago Press, 1956
Buku Teks
Hiqma Nur Agustina, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2002
UI - Tesis Membership
Irena Vania Margaret, author
2017
UI - Skripsi Membership
McGraw-Hill, 1973
Buku Teks