Campbell, W. (1913). The Elements of practical astronomy (2nd ed., rev. and enlarged.). Macmillan.
Cita Chicago Style (17a ed.)Campbell, W.W. The Elements of Practical Astronomy. 2nd ed., rev. and enlarged. New York [etc.]: Macmillan, 1913.
Cita MLA (9a ed.)Campbell, W.W. The Elements of Practical Astronomy. 2nd ed., rev. and enlarged. Macmillan, 1913.
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