E.  Valkeila, Brander, T., and Käpylä, M., ?Lounais-Hämeen myrkkypistiäisistä, Aculeata (Hymenoptera)?, Lounais-Hämeen Luonto, vol. 14, pp. 39-44, 1963.

E.  Valkeila, Brander, T., and Käpylä, M., ?Lisähavaintoja myrkkypistiäisistä, Aculeata (Hymenoptera) Lounais-Hämeessä?, Lounais-Hämeen Luonto, vol. 16, pp. 74-77, 1964.

A. K.  Merisuo and Käpylä, M., ?Records of a rare ant species, Camponotus vagus Rog. (Hymenoptera, Formicidae). ?, Annales Entomologici Fennici, vol. 41, p.  140, 1975.

M.  Käpylä and Niemelä, P., ?Flowers visited by honey bees in southern Finland.?, J. Sci. Agric. Soc. Finland , vol. 51, pp.  17-24, 1979.

M.  Käpylä, ?Foraging distance of a small solitary bee, Chelostoma maxillosum (Hymenoptera, Megachilidae).?, Annales Entomologici Fennici, vol. 44, pp. 63-64, 1978.

M.  Käpylä, ?Bionomics of five wood-nesting solitary species of bees (Hym., Megachilidae), with emphasis on flower relationships.?, Biol. Res. Rep. Univ. Jyväskylä, vol. 5, pp. 3-89, 1978.

M.  Käpylä, ?Records of rare species of bees (Hym., Apoidea) including a species new to Finland.?, Annales Entomologici Fennici, vol. 41, p. 143, 1975.

M.  Käpylä, ?Diurnal flight activity in a mixed population of Aculeata (Hym.).?, Annales Entomologici Fennici, vol. 40, pp. 61-69, 1974.

R.  Jussila and Käpylä, M., ?Obsevations on Townesia tenuiventris (Hlmgr.) (Hym., Ichneumonidae) and its hosts Chelostoma maxillosum (L.) (Hym., Megachilidae) and Trypoxylon figulus (L.) (Hym., Sphecidae).?, Annales Entomologici Fennici, vol. 41, pp. 81-86, 1975.