^Torrey, John G.; Thimann, Kenneth V. (1972). "On the beginning of modern studies of plant morphogenesis: a tribute to Ralph H. Wetmore's contributions". Botanical Gazette. 133 (3): 199–206. doi:10.1086/336634. JSTOR2473907. S2CID83710555.
^ abTorrey, John G. (1994). "Ralph H. Wetmore". Biographical Memoirs(PDF). Vol. 64. Washington D.C.: National Academy of Sciences. pp. 420–436.