APA

Alexander C. N., Langer E. J., . (1990). Higher stages of human development. New York: Oxford University Press.

Chicago

Alexander Charles N, Langer Ellen J, . 1990. Higher stages of human development. New York: Oxford University Press.

Harvard

Alexander C. N., Langer E. J., . (1990). Higher stages of human development. New York: Oxford University Press.

MLA

Alexander Charles N, Langer Ellen J, . Higher stages of human development. New York: Oxford University Press. 1990.