Siklódi Csilla szerk.: Tradicionális sportok, népi játékok (A Sportmúzeum Kincsei 2. Budapest, 1996)

Tradicionális sportok és játékok Finnországban (Riita Forsman, Kenth Sjöblöm, Juha Kanerva)

- photos of pitkapallo and pesapallo 1920-22 - correspondence with H.I. Koskelin about pesapallo, 1920-21 The Society of Finnish Literature (folklore archives) - T. Okkola'

s collections I-II, 1926 - play collection The Society of Swedish Literature in Finland (the folk culture archives) - collections of plays and games in the Swedish speaking regions of Finland; basic material for Maximilian Stejskal'

s dissertation on folk sports (see M. Stejskal, "Folking idrott", 1954) - photos related to these collections