Friedman WE, Williams JH «Modularity of the angiosperm female gametophyte and its bearing on the early evolution of endosperm in flowering plants». Evolution; International Journal of Organic Evolution, 57, 2, February 2003, pàg. 216–230. DOI: 10.1111/j.0014-3820.2003.tb00257.x. PMID: 12683519 [Consulta: 21 juny 2009].
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Friedman WE, Williams JH «Modularity of the angiosperm female gametophyte and its bearing on the early evolution of endosperm in flowering plants». Evolution; International Journal of Organic Evolution, 57, 2, February 2003, pàg. 216–230. DOI: 10.1111/j.0014-3820.2003.tb00257.x. PMID: 12683519 [Consulta: 21 juny 2009].