Penev, L. (1996): Large-scale variation in carabid assemblages, with special reference to the local fauna concept. Ann. Zool. Fennici, 33: 49–63.
Penev, L., Niemelä, J., Kotze, D.J., Chipev, N. (eds.) (2004): Ecology of the City of Sofia: Species and Communities in an Urban Environment. Pensoft, Sofia-Moscow.
Penka, M., Vyskot, M., Klimo, E., Vašíček, F. (1985):Floodplain forest ecosystem. I. Before water management measures. Academia, Praha.
Pennanen, T., Liski, J., Bååth, E., Kitunen, V., Uotila, J., Westman, C.J., Fritze, H. (1999): Structure of the Microbial Communities in Coniferous Forest Soils in Relation to Site Fertility and Stand Development Stage. Microb. Ecol., 38: 168-179.
