Cita APA (7a ed.)

Helsloot, I. (2012). Mega-crises: Understanding the prospects, nature, characteristics, and the effects of cataclysmic events. Charles C Thomas.

Cita Chicago Style (17a ed.)

Helsloot, I. Mega-crises: Understanding the Prospects, Nature, Characteristics, and the Effects of Cataclysmic Events. Springfield, Ill.: Charles C Thomas, 2012.

Cita MLA (8a ed.)

Helsloot, I. Mega-crises: Understanding the Prospects, Nature, Characteristics, and the Effects of Cataclysmic Events. Charles C Thomas, 2012.