Cita APA (7a ed.)

Radke, D. (1975). Contribution of the international tourism to the economic and social development of Sri Lanka. German Development Institute.

Cita Chicago Style (17a ed.)

Radke, Detlef. Contribution of the International Tourism to the Economic and Social Development of Sri Lanka. Berlin: German Development Institute, 1975.

Cita MLA (9a ed.)

Radke, Detlef. Contribution of the International Tourism to the Economic and Social Development of Sri Lanka. German Development Institute, 1975.