Sears, Minnie Earl
Sears list of subject headings
H. W. Wilson Co, 1977
 Buku Teks
Sears list of subject headings
edited by Barbara A. Bristow, Christi Showman Farrar
H.W. Wilson, a division of EBSCO Information Services ; Amenia, NY : Grey House Publishing, 2014
 Buku Referensi
Aitchison, Jean, 1938-
Unesco thesaurus : a structured list of descriptors for indexing and retrieving literature in the fields of education, science, social science, culture, and communication : volume 2 / compiled by Jean Aitchison
Unesco, 1977
 Buku Referensi
Aitchison, Jean, 1938-
Unesco thesaurus : a structured list of descriptors for indexing and retrieving literature in the fields of education, science, social science, culture, and communication : volume 1 / compiled by Jean Aitchison
Unesco, 1977
 Buku Referensi
Sears list of subject headings
edited by Joseph Miller
H.W. Wilson Company, 1997
 Buku Referensi