Keller, Helen Rex, author
McMillan Company, 1959
Buku Referensi
Campbell, Oscar James, author
Crofts, 1947
Buku Teks
Charles, W. Eliot, edited
P. F. Collier & Son Corporation, 1959 ; 1969
Buku Referensi
Shaw, J. C., author
D.K. Today, 1988
Buku Teks
Amalia Putri Astari, author
2015
UI - Makalah dan Kertas Kerja