Genre
Case studies
25
Sources
24
Biography
20
Periodicals
18
Handbooks, manuals, etc
9
Electronic books
7
Congresses
3
History
3
Interviews
3
Statistics
3
Cross-cultural studies
2
Curricula
2
Anecdotes
1
Encyclopedias
1
Fiction
1
Folklore
1
Longitudinal studies
1
Miscellanea
1
Outlines, syllabi, etc
1
Problems, exercises, etc
1