APA Edition Citation

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

Chicago Edition Citation

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

MLA Edition Citation

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