Zomlefer, W. B. (1994). Guide to flowering plant families. University of North Carolina Press.
Dyfyniad Arddull ChicagoZomlefer, Wendy B. Guide to Flowering Plant Families. Chapel Hill: University of North Carolina Press, 1994.
Dyfyniad MLAZomlefer, Wendy B. Guide to Flowering Plant Families. University of North Carolina Press, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.