Drew, J. V., Grossman, R. B., Retzer, J. L., Simonson, R. W., Smith, H. W., & Springer, M. E. (1967). Selected papers in soil formation and classification. Volume 1. Madison, Wisconsin: Soil Science Society of America.

Drew, J. V.,, R. B. Grossman, J. L. Retzer, R. W. Simonson, H. W. Smith, and M. E. Springer. Selected Papers in Soil Formation and Classification. Volume 1. Madison, Wisconsin: Soil Science Society of America, 1967.

Drew, J. V.,, et al. Selected Papers in Soil Formation and Classification. Volume 1. Madison, Wisconsin: Soil Science Society of America, 1967.