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Om värphöns bygger bland annat på följande källor:

Att främja god hälsa och välfärd hos ekologiska värphöns, från projektet Core Organic II, Helthy Hens, SLU.

Jensen Per, Världens vanligaste fågel – en kärleksförklaring till höns, Natur & Kultur, 2021.

Nimmermark, S., Sandström V., Berglund C., Algers B. Koldioxidavlivning av värphöns i inhysningsstallar, 2010. SLU.

Tidningen Djurskyddet, nr 4, 2016, Avel i kycklingindustrins tjänst

Så produceras äggen, en sammanställning av Svenska Ägg