by Hendricson, William D., Kleffner, John H.
Published in Journal of dental education (01.01.2002)

by Hendricson, William D, Kleffner, John H
Published in Journal of dental education (01.02.1998)

by Kleffner, John H, Dadian, Taline
Published in Journal of dental education (1997)

by Boyer, Arthur L., Kleffner, John, Mok, Edward C.
Published in International journal of radiation oncology, biology, physics (01.01.1984)

by Hendricson, William D., Hawkins, David W., Littlefield, John H., Kleffner, John H., Hudepohl, Nancy C., Herbert, Robert
Published in American journal of pharmaceutical education (1983)