APA-viite (7. p.)

Allen, D. A., & Allen, C. (1985). Halley, the once-in-a-lifetime comet. Unwin Paperbacks.

Chicago-viite (17. p.)

Allen, David A., ja Carol Allen. Halley, the Once-in-a-lifetime Comet. Sydney: Unwin Paperbacks, 1985.

MLA-viite (8. p.)

Allen, David A., ja Carol Allen. Halley, the Once-in-a-lifetime Comet. Unwin Paperbacks, 1985.