V otvete za budushchee /
Deri︠u︡gin, I︠U︡riĭ Ivanovich.
Erickson, John,1929-2002,former owner.StEdNL
Erickson, Ljubica,former owner.StEdNL
Moskva : Izd-vo DOSAAF SSSR,
1985.
John and Ljubica Erickson collection.