Παραπομπή APA

Harper, M. (1971). None can guess. Hodder and Stoughton.

Παραπομπή Chicago Style

Harper, Michael. None Can Guess. London: Hodder and Stoughton, 1971.

Παραπομπή MLA

Harper, Michael. None Can Guess. Hodder and Stoughton, 1971.