APA (7th ed.) Citation

De Silva, N. (1990). Directory of environmental expottise in Sri Lanka 1990. Central Environmontal Authority.

Chicago Style (17th ed.) Citation

De Silva, Nihal. Directory of Environmental Expottise in Sri Lanka 1990. Colombo: Central Environmontal Authority, 1990.

MLA (9th ed.) Citation

De Silva, Nihal. Directory of Environmental Expottise in Sri Lanka 1990. Central Environmontal Authority, 1990.

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