Organisation of Professional Associations of Sri Lanka. (1986). O.P.A. journal: The official publication of the Organization of Professional Associations of Sri Lanka. OPA.
Citace podle Chicago (17th ed.)Organisation of Professional Associations of Sri Lanka. O.P.A. Journal: The Official Publication of the Organization of Professional Associations of Sri Lanka. [Colombo]: OPA, 1986.
Citace podle MLA (8th ed.)Organisation of Professional Associations of Sri Lanka. O.P.A. Journal: The Official Publication of the Organization of Professional Associations of Sri Lanka. OPA, 1986.
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