Howard, H.W. (1980): The distribution at breeding time of the sexes of the woodlouse, Armadillidium vulgare (Latreille, 1802) (Isopoda). Crustaceana, 39: 52-58.
Howard, P.J.A. (1967): A method for studying the respiration and decomposition of litter. In: Graff, O., Satchell, J.E. (eds.): Progress in Soil Biology: Proceedings of the Colloquium on Dynamics of Soil Communities. Freidr. Vieweg & Sons, Braunschweig: 464-472. (ve sborníku)
Howard, P.J.A., Frankland, J.C. (1972):Effects of certain full and partial sterilization treatments on leaf litter and soil. Grange-over-Sands, Nature Conservancy, 19pp. (Merlewood Research and Development Paper No.36)