APA
Herath H., . (1990). Occupational Health: An introduction for Healthcare Workers. Colombo: New Karunadhara Press & Book Depot.
Chicago
Herath H.M.S.S.D, . 1990. Occupational Health: An introduction for Healthcare Workers. Colombo: New Karunadhara Press & Book Depot.
Harvard
Herath H., . (1990). Occupational Health: An introduction for Healthcare Workers. Colombo: New Karunadhara Press & Book Depot.
MLA
Herath H.M.S.S.D, . Occupational Health: An introduction for Healthcare Workers. Colombo: New Karunadhara Press & Book Depot. 1990.