The story of variable stars,
by Leon Campbell and Luigi Jacchia.
APA Citation
Campbell, L., Jacchia, L. G. (Luigi Giuseppe). (1941). The story of variable stars. Philadelphia: The Blakiston company.
MLA Citation
Campbell, Leon, 1881-1951, and Luigi G. (Luigi Giuseppe) Jacchia. The Story of Variable Stars. Philadelphia: The Blakiston company, 1941.
Warning: These citations may not always be complete (especially for serials).