APA (7th ed.) Citation

Lanka Book Depot Pvt Ltd. Letter Book Grade 10 & 11. Lanka Book Depot Colombo.

Chicago Style (17th ed.) Citation

Lanka Book Depot Pvt Ltd. Letter Book Grade 10 & 11. Colombo: Lanka Book Depot Colombo.

MLA (9th ed.) Citation

Lanka Book Depot Pvt Ltd. Letter Book Grade 10 & 11. Lanka Book Depot Colombo.

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