Hệ tọa độ xích đạo (Vietnamese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hệ tọa độ xích đạo" in Vietnamese language version.

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Nautical Almanac Office, U.S. Naval Observatory; H.M. Nautical Almanac Office; Royal Greenwich Observatory (1961). Explanatory Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical Almanac. H.M. Stationery Office, London (reprint 1974). tr. 24, 26.
Meeus, Jean (1991). Astronomical Algorithms. Willmann-Bell, Inc., Richmond, VA. tr. 137. ISBN 0-943396-35-2.
Peter Duffett-Smith (1988). Practical Astronomy with Your Calculator, third edition. Cambridge University Press. tr. 28–29. ISBN 0-521-35699-7.
Meir H. Degani (1976). Astronomy Made Simple. Doubleday & Company, Inc. tr. 216. ISBN 0-385-08854-X.
Peter Duffett-Smith (1988). Practical Astronomy with Your Calculator, third edition. Cambridge University Press. tr. 34–36. ISBN 0-521-35699-7.