Citazione Stile APA (7a Edizione)

Hurd, P. D. (1969). New Directions in teaching secondary school science. Rand McNally.

Citazione stile Chigago Style (17a edizione)

Hurd, Paul Dehart. New Directions in Teaching Secondary School Science. Chicago: Rand McNally, 1969.

Citatione MLA (9a ed.)

Hurd, Paul Dehart. New Directions in Teaching Secondary School Science. Rand McNally, 1969.