Παραπομπή APA

Heck, A., & Perdang, J. (1991). Applying fractals in astronomy. Springer-Verlag.

Παραπομπή Chicago Style

Heck, A., και J.M Perdang. Applying Fractals in Astronomy. New York: Springer-Verlag, 1991.

Παραπομπή MLA

Heck, A., και J.M Perdang. Applying Fractals in Astronomy. Springer-Verlag, 1991.