APA

Powers D. L., . (1979). Boundary value problems. New York [u.a.]: Academic Press.

Chicago

Powers David L, . 1979. Boundary value problems. New York [u.a.]: Academic Press.

Harvard

Powers D. L., . (1979). Boundary value problems. New York [u.a.]: Academic Press.

MLA

Powers David L, . Boundary value problems. New York [u.a.]: Academic Press. 1979.