Cita APA (7th ed.)

Hurlock, E. B. (1980). Development psychology: Alife-span approach (5th. ed.). Mc Graw Hill.

Cita Chicago (17th ed.)

Hurlock, Elizabeth B. Development Psychology: Alife-span Approach. 5th. ed. Mc Graw Hill, 1980.

Cita MLA (9th ed.)

Hurlock, Elizabeth B. Development Psychology: Alife-span Approach. 5th. ed. Mc Graw Hill, 1980.