Hartung, E. J. (1968). Astronomical objects for southern telescopes, with an addendum for northern observatories: A handbook for amateur observers. Cambridge U.P..
Citace podle Chicago (17th ed.)Hartung, E. J. Astronomical Objects for Southern Telescopes, with an Addendum for Northern Observatories: A Handbook for Amateur Observers. London: Cambridge U.P., 1968.
Citace podle MLA (8th ed.)Hartung, E. J. Astronomical Objects for Southern Telescopes, with an Addendum for Northern Observatories: A Handbook for Amateur Observers. Cambridge U.P., 1968.
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