Cavalier-Smith, T. (1992). "Origins of Secondary Metabolism". Ciba Foundation Symposium 171 - Secondary Metabolites: Their Function and Evolution. Novartis Foundation Symposia. Vol.171. pp.64–80, discussion 80–87. doi:10.1002/9780470514344.ch5. ISBN9780470514344. ISSN0300-5208. PMID1302186.
Cavalier-Smith, T. (1992). "Origins of Secondary Metabolism". Ciba Foundation Symposium 171 - Secondary Metabolites: Their Function and Evolution. Novartis Foundation Symposia. Vol.171. pp.64–80, discussion 80–87. doi:10.1002/9780470514344.ch5. ISBN9780470514344. ISSN0300-5208. PMID1302186.
Cavalier-Smith, T. (1992). "Origins of Secondary Metabolism". Ciba Foundation Symposium 171 - Secondary Metabolites: Their Function and Evolution. Novartis Foundation Symposia. Vol.171. pp.64–80, discussion 80–87. doi:10.1002/9780470514344.ch5. ISBN9780470514344. ISSN0300-5208. PMID1302186.