Cargo, R. T., Mickel, E. J., & Engstrom, A. G. (1972). Studies in honor of Alfred G. Engstrom. University of North Carolina Press.

Cargo, Robert T., Emanuel J. Mickel, and Alfred G. Engstrom. Studies in Honor of Alfred G. Engstrom. Chapel Hill: University of North Carolina Press, 1972.

Cargo, Robert T., et al. Studies in Honor of Alfred G. Engstrom. University of North Carolina Press, 1972.