Cita APA (7a ed.)

Clay, N. L. (1945). English exercises; book one. Heinemann (L.).

Cita Chicago Style (17a ed.)

Clay, N. L. English Exercises; Book One. London: Heinemann (L.), 1945.

Cita MLA (9a ed.)

Clay, N. L. English Exercises; Book One. Heinemann (L.), 1945.