Genre
Case studies
3
Instructional films
3
Problems, exercises, etc
3
Congresses
2
Educational films
2
Juvenile literature
2
Juvenile works
2
Problems and exercises
2
Study guides
2
Audio-visual aids
1
Charts, diagrams, etc
1
Conference papers and proceedings
1
Cross-cultural studies
1
Instructional and educational works
1
Longitudinal studies
1
Programmed instruction
1
Study and teaching (Middle school)
1