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wikipedia.org
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Loiselle, Paul V. (1995). The Cichlid Aquarium. Germany: Tetra Press. ISBN1-56465-146-0. Cite has empty unknown parameter: |coauthors= (bantuan)
Chong, K. (2005-09-12). "Characterisation of proteins in epidermal mucus of discus fish (Symphysodon spp.) during parental phase". Aquaculture. 249: 469–476. doi:10.1016/j.aquaculture.2005.02.045. Unknown parameter |coauthors= ignored (|author= suggested) (bantuan)