Wightwick, C. (2005). German grammar handbook. Berlitz Pub.
Cita Chicago (17th ed.)Wightwick, Christopher. German Grammar Handbook. Singapore: Berlitz Pub, 2005.
Cita MLA (9th ed.)Wightwick, Christopher. German Grammar Handbook. Berlitz Pub, 2005.
Atenció: Aquestes cites poden no estar 100% correctes.