Lovett, J. & Clarke, G.P. (1998). Psychotria alsophila. The IUCN Red List of Threatened Species 1998: e.T35769A9956948. doi:10.2305/IUCN.UK.1998.RLTS.T35769A9956948.en Downloaded on 12 June 2019.
Luke, W.R.Q., Musili, P., Barasa, J. & Mathenge, J. (2018). Psychotria crassipetala. The IUCN Red List of Threatened Species 2018: e.T32252A84419018. doi:10.2305/IUCN.UK.2018-2.RLTS.T32252A84419018.en Downloaded on 12 June 2019.
Musili, P., Luke, W.R.Q., Barasa, J. & Mathenge, J. (2018). Psychotria petitii. The IUCN Red List of Threatened Species 2018: e.T32253A84419050. doi:10.2305/IUCN.UK.2018-2.RLTS.T32253A84419050.en Downloaded on 12 June 2019.
Lovett, J. & Clarke, G.P. (1998). Psychotria pseudoplatyphylla. The IUCN Red List of Threatened Species 1998: e.T34457A9869836. doi:10.2305/IUCN.UK.1998.RLTS.T34457A9869836.en Downloaded on 12 June 2019.
World Conservation Monitoring Centre (1998). Psychotria taitensis. The IUCN Red List of Threatened Species 1998: e.T32254A9691643. doi:10.2305/IUCN.UK.1998.RLTS.T32254A9691643.en Downloaded on 12 June 2019.