Cite Them Right 11th edition - Harvard

Christian Wenz and Christian Wenz (2007) Programming ASP.NET AJAX : Build Rich, Web 2.0-Style UI with ASP.NET AJAX.

Chicago Manual of Style 17th edition (full note)

Christian Wenz, and Christian Wenz. Programming ASP.NET AJAX : Build Rich, Web 2.0-Style UI with ASP.NET AJAX.

American Psychological Association 7th edition

Christian Wenz, & Christian Wenz. (2007). Programming ASP.NET AJAX : Build Rich, Web 2.0-Style UI with ASP.NET AJAX.

Modern Language Association 9th edition

Christian Wenz, and Christian Wenz. Programming ASP.NET AJAX : Build Rich, Web 2.0-Style UI with ASP.NET AJAX. 2007.

ISO-690 (author-date, Deutsch)

CHRISTIAN WENZ and CHRISTIAN WENZ, 2007. Programming ASP.NET AJAX : Build Rich, Web 2.0-Style UI with ASP.NET AJAX

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