APA-referens (7:e uppl.)

Kristensson, G. (2010). Second order differential equations: Special functions and their classification. Springer Science + Business Media LLC.

Chicago-referens (17:e uppl.)

Kristensson, Gerhard. Second Order Differential Equations: Special Functions and Their Classification. New York: Springer Science + Business Media LLC, 2010.

MLA-referens (9:e uppl.)

Kristensson, Gerhard. Second Order Differential Equations: Special Functions and Their Classification. Springer Science + Business Media LLC, 2010.