Strickland, R. G. (1938). A study of the possibilities of graphs as a means of instruction in the first four grades of the elementary school.
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Chicago Style (17th ed.) Zitazioa
Strickland, Ruth Gertrude. A Study of the Possibilities of Graphs as a Means of Instruction in the First Four Grades of the Elementary School. New York, 1938.
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MLA (9th ed.) Zitazioa
Strickland, Ruth Gertrude. A Study of the Possibilities of Graphs as a Means of Instruction in the First Four Grades of the Elementary School. 1938.
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