APA (7th ed.) Citation

Kruse, A., & Schmitz-Scherzer, R. (1995). Vorwort. Psychologie der Lebensalter.

Chicago Style (17th ed.) Citation

Kruse, Andreas, and Reinhard Schmitz-Scherzer. "Vorwort." Psychologie Der Lebensalter 1995.

MLA (9th ed.) Citation

Kruse, Andreas, and Reinhard Schmitz-Scherzer. "Vorwort." Psychologie Der Lebensalter, 1995.

Warning: These citations may not always be 100% accurate.