APA (7th ed.) Citation

Ratnayake. (2006). Mathematics Activity book Grade 9. Sadeepa Publihing house.

Chicago Style (17th ed.) Citation

Ratnayake. Mathematics Activity Book Grade 9. Colombo: Sadeepa Publihing house, 2006.

MLA (9th ed.) Citation

Ratnayake. Mathematics Activity Book Grade 9. Sadeepa Publihing house, 2006.

Warning: These citations may not always be 100% accurate.