Lua APA (7ú heag.)
Geerling, J. (1929). Sclerosis annularis valvularum.
Lua i Stíl Chicago (17ú heag.)
Geerling, Johann. Sclerosis Annularis Valvularum. Groningen, 1929.
Lua MLA (9ú heag.)
Geerling, Johann. Sclerosis Annularis Valvularum. 1929.
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