Παραπομπή APA

Kettle, A. (1978). Open university: Introduction to literature. Open University Press.

Παραπομπή Chicago Style

Kettle, Arnold. Open University: Introduction to Literature. Milton Keynes: Open University Press, 1978.

Παραπομπή MLA

Kettle, Arnold. Open University: Introduction to Literature. Open University Press, 1978.