APA (7th ed.) Citation

Ullrich, F., & Schwalm, H. (2011). Legacy swarm for the Ruhrgebiet: Bob Braine, Mark Dion & GFLK Surveys. Kettler.

Chicago Style (17th ed.) Citation

Ullrich, Ferdinand, and Hans-Jürgen Schwalm. Legacy Swarm for the Ruhrgebiet: Bob Braine, Mark Dion & GFLK Surveys. Bönen: Kettler, 2011.

MLA (8th ed.) Citation

Ullrich, Ferdinand, and Hans-Jürgen Schwalm. Legacy Swarm for the Ruhrgebiet: Bob Braine, Mark Dion & GFLK Surveys. Kettler, 2011.

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