Cita APA

Urban, S. E., & Seidelmann, P. K. (2013). Explanatory supplement to the Astronomical almanac (3rd ed.). University Science Books.

Citación estilo Chicago

Urban, Sean E., and P. Kenneth Seidelmann. Explanatory Supplement to the Astronomical Almanac. 3rd ed. Mill Valley, Calif.: University Science Books, 2013.

Cita MLA

Urban, Sean E., and P. Kenneth Seidelmann. Explanatory Supplement to the Astronomical Almanac. 3rd ed. University Science Books, 2013.