......... G.C.E O/L Science Questions with Answers. Astan Publications.
Chicago Style (17th ed.) Citation......... G.C.E O/L Science Questions with Answers. Colombo: Astan Publications.
MLA (9th ed.) Citation......... G.C.E O/L Science Questions with Answers. Astan Publications.
Warning: These citations may not always be 100% accurate.