@book{16581,
	author = {Witkowska, Helena and Sawicki, Ludomir,},
	title = {Nauka o Polsce współczesnej},
	publisher = {Wydawn. M. Arcta},
	year = {1920.},
	address = {W Warszawie},
	note = {At head of title: Helena Witkowska i Ludomir Sawicki.}
}