Tsou, C.-H.; Fu, Y.-L. (2002). "Tetrad pollen formation in Annona (Annonaceae): proexine formation andbinding mechanism". American Journal of Botany. 89 (5): 734–747. doi:10.3732/ajb.89.5.734. ISSN0002-9122. PMID21665673.
nih.gov
ncbi.nlm.nih.gov
Tsou, C.-H.; Fu, Y.-L. (2002). "Tetrad pollen formation in Annona (Annonaceae): proexine formation andbinding mechanism". American Journal of Botany. 89 (5): 734–747. doi:10.3732/ajb.89.5.734. ISSN0002-9122. PMID21665673.
purdue.edu
hort.purdue.edu
Morton, Julia F (1999-04-02). "Wild Custard Apple". New Crops. Department of Horticulture and Landscape Architecture, Purdue University. hlm. 86–88. Diarsipkan dari versi asli tanggal 9 May 2008. Diakses tanggal 2008-04-18.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
Morton, Julia F (1999-04-02). "Wild Custard Apple". New Crops. Department of Horticulture and Landscape Architecture, Purdue University. hlm. 86–88. Diarsipkan dari versi asli tanggal 9 May 2008. Diakses tanggal 2008-04-18.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
worldcat.org
Tsou, C.-H.; Fu, Y.-L. (2002). "Tetrad pollen formation in Annona (Annonaceae): proexine formation andbinding mechanism". American Journal of Botany. 89 (5): 734–747. doi:10.3732/ajb.89.5.734. ISSN0002-9122. PMID21665673.