Karen L. Wilson, Report of the Nomenclature Committee for Vascular Plants: 66: (1933). To conserve Malus domestica Borkh. against M. pumila Miller, Taxon
doi:10.1006/jesp.2001.1497. Jones, John T.; Pelham, Brett W.; Carvallo, Mauricio; Mirenberg, Matthew C. How do I love thee? Let me count the Js: Implicit