Girdano, D. A. (1981). Better late than never. Prentice-Hall.
Chicago Style aipamenaGirdano, Daniel A. Better Late than Never. Englewood Cliffs, N.J: Prentice-Hall, 1981.
MLA aipamenaGirdano, Daniel A. Better Late than Never. Prentice-Hall, 1981.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.