Кастор (звезда) — разлика између измена

* {{Cite book | title=Philip's Astronomy Encyclopaedia | editor = Patrick Moore | publisher=Philip's | year=2002 | location=London |language = {{ен}} | isbn=0-540-07863-8| ref = harv}}

* {{Cite book|editor = Paul Murdin | year = 2001 | title = Encyclopedia of Astronomy and Astrophysics | publisher = Institure of Physics Publishing |language = {{ен}} | id = ISBN 0-7503-0440-5| ref = harv}}