Swallow, A. (1963). Introductory general science, book one. Longmans.
Chicago Style aipamenaSwallow, A. Introductory General Science, Book One. London: Longmans, 1963.
MLA aipamenaSwallow, A. Introductory General Science, Book One. Longmans, 1963.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.