Alliluyeva, S. (1967). Twenty letters to a friend. London: Penguin Books.
Chicago Style aipamenaAlliluyeva, Svetlana. Twenty Letters to a Friend. London: Penguin Books, 1967.
MLA aipamenaAlliluyeva, Svetlana. Twenty Letters to a Friend. London: Penguin Books, 1967.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.