APA Style

Nagel, C. et al (2014). Professional C♯ 5.0 and .NET 4.5.1 . Indianapolis, Ind.: John Wiley & Sons.

MLA Style

Nagel, Christian. et al. "Professional C♯ 5.0 and .NET 4.5.1". Indianapolis, Ind.: John Wiley & Sons, 2014. Text.