APA

Gerg W.F, . (1972). Current Problems in Electrophotography. Berlin: Walter de Gruyter.

Chicago

Gerg W.F, . 1972. Current Problems in Electrophotography. Berlin: Walter de Gruyter.

Harvard

Gerg W.F, . (1972). Current Problems in Electrophotography. Berlin: Walter de Gruyter.

MLA

Gerg W.F, . Current Problems in Electrophotography. Berlin: Walter de Gruyter. 1972.