Birke, Dorothee (Ed.), Michael Butter (Ed.) and Tilmann Köppe (Ed.). Counterfactual Thinking - Counterfactual Writing. Berlin, Boston: De Gruyter, 2011. Web. Retrieved 20 May. 2013, from http://www.degruyter.com/view/product/179548

Birke, D. (Ed.), Butter, M. (Ed.) & Köppe, T. (Ed.) (2011). Counterfactual Thinking - Counterfactual Writing. Berlin, Boston: De Gruyter. Retrieved 20 May. 2013, from http://www.degruyter.com/view/product/179548

Birke, Dorothee (Ed.), Michael Butter (Ed.) and Tilmann Köppe (Ed.). 2011. Counterfactual Thinking - Counterfactual Writing. Berlin, Boston: De Gruyter. Retrieved 20 May. 2013, from http://www.degruyter.com/view/product/179548