APA (7th ed.) Citation

Härdle, W., Klinke, S., & Müller, M. (1999). XploRe -- Learning Guide. Springer Berlin Heidelberg.

Chicago Style (17th ed.) Citation

Härdle, Wolfgang, S. Klinke, and Marlene Müller. XploRe -- Learning Guide. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999.

MLA (9th ed.) Citation

Härdle, Wolfgang, et al. XploRe -- Learning Guide. Springer Berlin Heidelberg, 1999.