APA

Gilbert J. G., . (1952). Understanding old age. New York: Ronald Press.

Chicago

Gilbert Jeanne Gifford, . 1952. Understanding old age. New York: Ronald Press.

Harvard

Gilbert J. G., . (1952). Understanding old age. New York: Ronald Press.

MLA

Gilbert Jeanne Gifford, . Understanding old age. New York: Ronald Press. 1952.