APA (7th ed.) Citation

Sifton, P., & Dragani, N. (1989). Workbook for DDC 20: Dewey decimal classification edition 20. Canadian Library Association.

Chicago Style (17th ed.) Citation

Sifton, Pat, and Noreen Dragani. Workbook for DDC 20: Dewey Decimal Classification Edition 20. Ottawa: Canadian Library Association, 1989.

MLA (9th ed.) Citation

Sifton, Pat, and Noreen Dragani. Workbook for DDC 20: Dewey Decimal Classification Edition 20. Canadian Library Association, 1989.