APA aipamena

Gronau, H. e., Langmann ,Hanns-Heinrich.ed, & Schleicher, D. (2011). 50th IMO - 50 years of International Mathematical Olympiads. Springer.

Chicago Style aipamena

Gronau, Hans-Dietrich ed, Langmann ,Hanns-Heinrich.ed, and Dierk,ed Schleicher. 50th IMO - 50 Years of International Mathematical Olympiads. Heidelberg: Springer, 2011.

MLA aipamena

Gronau, Hans-Dietrich ed, et al. 50th IMO - 50 Years of International Mathematical Olympiads. Springer, 2011.