Cita APA (7a ed.)
Friend, S. (2000). Shaping the earth erosion. Twenty-First Century Books.
Cita Chicago Style (17a ed.)
Friend, Sandra. Shaping the Earth Erosion. Brookfield, Conn.: Twenty-First Century Books, 2000.
Cita MLA (9a ed.)
Friend, Sandra. Shaping the Earth Erosion. Twenty-First Century Books, 2000.
Precaución: Estas citas no son 100% exactas.