Engel, H., & Rapson, R. (2007). Structure systems. Hatje Cantz Verlag.
Cita Chicago (17th ed.)Engel, Heino, i Ralph Rapson. Structure Systems. Ostfildern: Hatje Cantz Verlag, 2007.
Cita MLA (8th ed.)Engel, Heino, i Ralph Rapson. Structure Systems. Hatje Cantz Verlag, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.