1. H. Abe, 1968 .Growth and development in two forms of Clethrionomys. 1. External characters, body weight, sexual maturity and behavior., Bulletin of Hokkaido Forest Experiment Station, 6 :69 –89 .(in Japanese with English summary).
2. Home Range and Social Organization of the Singing Vole (Microtus miurus)
3. Mating system of the meadow vole, Microtus pennsylvanicus
4. G. Bujalska, 1985 .Regulation of female maturation in Clethrionomys species, with special reference to an island population of C. glareolus., Annales Zoologici Fennici, 22 :331 –342.
5. Review Lecture: Mammalian mating systems