Cita APA (7th ed.)

Colombo Plan Bureau, Goonetilleke, L. P., & Lee, B. H. (1971). The Colombo Plan, 1951-1971: 20th anniversary. s.n.

Cita Chicago (17th ed.)

Colombo Plan Bureau, Lionel Perera Goonetilleke, i Byung Hak Lee. The Colombo Plan, 1951-1971: 20th Anniversary. [Colombo: s.n, 1971.

Cita MLA (9th ed.)

Colombo Plan Bureau, et al. The Colombo Plan, 1951-1971: 20th Anniversary. s.n, 1971.