Nordenstam, B. 1994: Tribe Calenduleae. In: Bremer, K. Asteraceae: Cladistics and Classification. Timber Press, Portland, Oregon, USA. 365–375.
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| Nordenstam, B. 1994: Tribe Calenduleae. In: Bremer, K. Asteraceae: Cladistics and Classification. Timber Press, Portland, Oregon, USA. 365–375. |