She became a best-selling author, writing three books about beauty, skin care, and health: "The Body Principal" (1983), "The Beauty Principal" (1984), and "The Diet Principal" (1987).
Принципал также успешный автор, она выпустила три книги об уходе за собой: "The Body Principal" (1983), "The Beauty Principal" (1984) и "The Diet Principal" (1987).