Schuchert, Peter (1993-03-01). "Trichoplax adhaerens (Phylum Placozoa) has Cells that React with Antibodies Against the Neuropeptide RFamide". Acta Zoologica. 74 (2): 115–117. doi:10.1111/j.1463-6395.1993.tb01227.x.
Syed, Tareq; Schierwater, Bernd (2002-06-01). "The evolution of the placozoa: A new morphological model". Senckenbergiana Lethaea. 82 (1): 315–324. doi:10.1007/bf03043791. ISSN0037-2110. S2CID16870420.
Layden, Michael J. (2018), "Cnidarian Zic Genes", Zic family, Advances in Experimental Medicine and Biology (dalam bahasa Inggris), vol. 1046, Springer, Singapore, hlm. 27–39, doi:10.1007/978-981-10-7311-3_2, ISBN9789811073106, PMID29442315
Layden, Michael J. (2018), "Cnidarian Zic Genes", Zic family, Advances in Experimental Medicine and Biology (dalam bahasa Inggris), vol. 1046, Springer, Singapore, hlm. 27–39, doi:10.1007/978-981-10-7311-3_2, ISBN9789811073106, PMID29442315
Syed, Tareq; Schierwater, Bernd (2002-06-01). "The evolution of the placozoa: A new morphological model". Senckenbergiana Lethaea. 82 (1): 315–324. doi:10.1007/bf03043791. ISSN0037-2110. S2CID16870420.
Syed, Tareq; Schierwater, Bernd (2002-06-01). "The evolution of the placozoa: A new morphological model". Senckenbergiana Lethaea. 82 (1): 315–324. doi:10.1007/bf03043791. ISSN0037-2110. S2CID16870420.