Urban, S. E., & Seidelmann, P. K. (2013). Explanatory supplement to the Astronomical almanac (3rd ed.). University Science Books.
Citación estilo ChicagoUrban, Sean E., and P. Kenneth Seidelmann. Explanatory Supplement to the Astronomical Almanac. 3rd ed. Mill Valley, Calif.: University Science Books, 2013.
Cita MLAUrban, Sean E., and P. Kenneth Seidelmann. Explanatory Supplement to the Astronomical Almanac. 3rd ed. University Science Books, 2013.
Warning: These citations may not always be 100% accurate.