APA (7th ed.) Citation

Astan. (2012). GCE O' Level: வரலாறுI & II (2008-2012). Astan Publication.

Chicago Style (17th ed.) Citation

Astan. GCE O' Level: வரலாறுI & II (2008-2012). Colombo: Astan Publication, 2012.

MLA (9th ed.) Citation

Astan. GCE O' Level: வரலாறுI & II (2008-2012). Astan Publication, 2012.

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