APA (7th ed.) Citation

Ratnayaka, Y. (1999). Hand book of drug abuse information 1992-19961999. National Dangerous Drugs Control Board.

Chicago Style (17th ed.) Citation

Ratnayaka, Y. Hand Book of Drug Abuse Information 1992-19961999. Rajagiriya: National Dangerous Drugs Control Board, 1999.

MLA (9th ed.) Citation

Ratnayaka, Y. Hand Book of Drug Abuse Information 1992-19961999. National Dangerous Drugs Control Board, 1999.

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