APA-viite (7. p.)

Noble, E., Sorger, L., Keith, L., & Jacob, M. M. (1991). Having twins: A parent's guide to pregnancy, birth, and early childhood (2nd ed.). Houghton Mifflin.

Chicago-viite (17. p.)

Noble, Elizabeth, Leo Sorger, Louis Keith, ja Maya M. Jacob. Having Twins: A Parent's Guide to Pregnancy, Birth, and Early Childhood. 2nd ed. Boston: Houghton Mifflin, 1991.

MLA-viite (9. p.)

Noble, Elizabeth, et al. Having Twins: A Parent's Guide to Pregnancy, Birth, and Early Childhood. 2nd ed. Houghton Mifflin, 1991.