Forgey, Staci. "Angiosperm Double Fertilization". OER Commons. Institute for the Study of Knowledge Management in Education, 02 Mar. 2017. Web. 04 May 2024. <https://oercommons.org/authoring/20663-angiosperm-double-fertilization>.
Forgey, S. (2017, March 02). Angiosperm Double Fertilization. OER Commons. Retrieved May 04, 2024, from https://oercommons.org/authoring/20663-angiosperm-double-fertilization.