Tohutoro APA (7th ed.)
Heathfield, D. F. (1971). Production functions. Macmillan.
Tohutoru Kātū Chicago (17th ed.)
Heathfield, David F. Production Functions. London: Macmillan, 1971.
Tohutoro MLA (9th ed.)
Heathfield, David F. Production Functions. Macmillan, 1971.
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