Woodward, John and George Burnett (1969). Woodward's a treatise on heraldry, British and foreign,page 203. Originally published 1892, Edinburgh: W. & A. B. Johnson. ISBN 0715344641. Templat:LCCN
Gloria Steinem menulis dalam 1998 prakata[pautan mati kekal]Vagina Monologues: "For example, the shape we call a heart—whose symmetry resembles the vulva far more than the asymmetry of the organ that shares its name—is probably a residual female genital symbol. It was reduced from power to romance by centuries of male dominance."
