Stephenson, Ray. Sedum : cultivated stonecrops / Ray Stephenson. - Portland, Or. : Timber Press, c1994. - 335 p. : ill. (some col.) ; 27 cm. Includes bibliographical references (p. 320-325) and index. ISBN: 0881922382 LCCN: 93-683 Subjects--Topical Terms: Sedum.