Genre
- Case studies 20 canlyniadau
- Congresses 18 canlyniadau
- Problems, exercises, etc 8 canlyniadau
- Statistics 8 canlyniadau
- Handbooks, manuals, etc 7 canlyniadau
- Juvenile literature 7 canlyniadau
- Periodicals 5 canlyniadau
- Cross-cultural studies 4 canlyniadau
- Juvenile fiction 4 canlyniadau
- Biography 2 canlyniadau
- Longitudinal studies 2 canlyniadau
- Popular works 2 canlyniadau
- Computer games 1 canlyniadau
- Dictionaries 1 canlyniadau
- Interviews 1 canlyniadau
- Readers 1 canlyniadau
- Sources 1 canlyniadau
- Study guides 1 canlyniadau