Topp, W., Kappes, H., Kulfan, J., Zach, P. (2006): Distribution pattern of woodlice (Isopoda) and millipedes (Diplopoda) in four primeval forests of the Western Carpathians (Central Slovakia). Soil Biology & Biochemistry, 38: 43-50.
Topp, W., Kappes, H., Kulfan, J., Zach, P. (2006): Litter-dwelling beetles in primeval forests of Central Europe: does deadwood matter? Journal of Insect Conservation, 10: 229–239.
Topping, C.J., Sunderland, K.D. (1992):Limitations to the use of pitfall traps in ecological studies exemplified by a study of spiders in a field of winter wheat. Journal of Applied Ecology, 29: 485-491.