APA (7th ed.) Citation

De Silva, B. (1999). New workbook: Grade 6. Bernard de Silva.

Chicago Style (17th ed.) Citation

De Silva, Bernard. New Workbook: Grade 6. Colombo: Bernard de Silva, 1999.

MLA (9th ed.) Citation

De Silva, Bernard. New Workbook: Grade 6. Bernard de Silva, 1999.

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