APA (7th ed.) Citation

KPK Premaratne. (2009). SECONDARY MATHEMATICS GRADE 11. International Book House.

Chicago Style (17th ed.) Citation

KPK Premaratne. SECONDARY MATHEMATICS GRADE 11. Kurunagala: International Book House, 2009.

MLA (9th ed.) Citation

KPK Premaratne. SECONDARY MATHEMATICS GRADE 11. International Book House, 2009.

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