MLA

Balby Marinho, Leandro, et al. Recommender Systems for Social Tagging Systems. Springer US, 2012.

APA

Balby Marinho, L., Hotho, A., Jäschke, R., Nanopoulos, A., Rendle, S., Schmidt-Thieme, L., Stumme, G., & Symeonidis, P. (2012). Recommender Systems for Social Tagging Systems. Springer US.

Chicago

Balby Marinho, Leandro, Andreas Hotho, Robert Jäschke, Alexandros Nanopoulos, Steffen Rendle, Lars Schmidt-Thieme, Gerd Stumme, and Panagiotis Symeonidis. Recommender Systems for Social Tagging Systems. : Springer US, 2012.