JACOBSON, W. J. (1970). The new elementary school science. Van Nostrand Reinhold.
Cita Chicago (17th ed.)JACOBSON, Willard J. The New Elementary School Science. New York: Van Nostrand Reinhold, 1970.
Cita MLA (9th ed.)JACOBSON, Willard J. The New Elementary School Science. Van Nostrand Reinhold, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.