Rudolf, P.O.; Slabaugh, P.E.; Shaw, N.L. 2008. Syringa L.: Lilac. In: Bonner, Franklin T.; Karrfalt, Robert P., eds. The Woody Plant Seed Manual. Agric. Handbook No. 727. Washington, DC. U.S. Department of Agriculture, Forest Service: 1083-1086.
Rudolf, P.O.; Slabaugh, P.E.; Shaw, N.L. 2008. Syringa L.: Lilac. In: Bonner, Franklin T.; Karrfalt, Robert P., eds. The Woody Plant Seed Manual. Agric. Handbook No. 727. Washington, DC. U.S. Department of Agriculture, Forest Service: 1083-1086.