Tuan, Yi-fu
Columbia University, 1990
Buku Teks
The Association for Supervision and Curriculum Development, 1978
Buku Teks
Mattulada, H. Andi, author
Pustaka Sinar Harapan, 1994
Buku Teks
Voice of American Forum Lectures, 1968
Buku Teks
Otto Soemarwoto, author
Djambatan, 1983
Buku Teks