APA (7th ed.) Citation

Astan Publication. O' level வரலாறு I & II. Astan Publication Colombo.

Chicago Style (17th ed.) Citation

Astan Publication. O' Level வரலாறு I & II. Colombo: Astan Publication Colombo.

MLA (9th ed.) Citation

Astan Publication. O' Level வரலாறு I & II. Astan Publication Colombo.

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