APA استشهاد

Smil, V. A. (2008). Global catastrophes and trends: The next 50 years.

استشهاد بنمط شيكاغو

Smil, Vaclav; Author. Global Catastrophes and Trends: The Next 50 Years. Massachusetts, The MIT Press, 2008.

MLA استشهاد

Smil, Vaclav; Author. Global Catastrophes and Trends: The Next 50 Years. 2008.