APA-viite (7. p.)
Kretz, W. C. (1900). The Positions and proper motions of the principal stars in the cluster of coma Berenices.
Chicago-viite (17. p.)
Kretz, Walter Coluzzi. The Positions and Proper Motions of the Principal Stars in the Cluster of Coma Berenices. New York, 1900.
MLA-viite (9. p.)
Kretz, Walter Coluzzi. The Positions and Proper Motions of the Principal Stars in the Cluster of Coma Berenices. 1900.
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