Cita APA (7a ed.)

Elkan, W. (1973). An introduction to development economics. Penguin Books.

Cita Chicago Style (17a ed.)

Elkan, Walter. An Introduction to Development Economics. Harmondsworth [etc.]: Penguin Books, 1973.

Cita MLA (9a ed.)

Elkan, Walter. An Introduction to Development Economics. Penguin Books, 1973.