Tohutoro APA (7th ed.)
Guthnick, P. (1942). Variabilis 389 Cygni: Mitteilung 3.
Tohutoru Kātū Chicago (17th ed.)
Guthnick, Paul. Variabilis 389 Cygni: Mitteilung 3. Berlin, 1942.
Tohutoro MLA (9th ed.)
Guthnick, Paul. Variabilis 389 Cygni: Mitteilung 3. 1942.
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