APA

Helgason S., . (1962). Differential geometry and symetric spaces. New York: Academic Press.

Chicago

Helgason Sigurdur, . 1962. Differential geometry and symetric spaces. New York: Academic Press.

Harvard

Helgason S., . (1962). Differential geometry and symetric spaces. New York: Academic Press.

MLA

Helgason Sigurdur, . Differential geometry and symetric spaces. New York: Academic Press. 1962.