Cita APA (7a ed.)

Bekkering, B., & Bekkering, G. (1988). Piece by Piece: A History of the Jig-saw Puzzle in the Netherlands. Van Soeren und Co..

Cita Chicago Style (17a ed.)

Bekkering, Betsy, y Geert Bekkering. Piece by Piece: A History of the Jig-saw Puzzle in the Netherlands. Amsterdam: Van Soeren und Co., 1988.

Cita MLA (8a ed.)

Bekkering, Betsy, y Geert Bekkering. Piece by Piece: A History of the Jig-saw Puzzle in the Netherlands. Van Soeren und Co., 1988.