Richard L. Cifelli

First Early Cretaceous mammal from the eastern seaboard of the United States

Timothy B. Rowe, T. Rowe, Richard L. Cifelli, 1999 .

Earliest Evidence of Deltatheroida (Mammalia: Metatheria) from the Early Cretaceous of North America

Richard L. Cifelli, Zofia Kielan-Jaworowska, R. Cifelli, 2008 .

Dentition and Jaw of Kokopellia juddi, a Primitive Marsupial or Near-Marsupial from the Medial Cretaceous of Utah

C. de Muizon, Richard L. Cifelli, R. Cifelli, 1997, Journal of Mammalian Evolution.