Cita APA (7th ed.)

Heady, E. O., & Dillon, J. L. Agricultural production functions (5a ed.).

Cita Chicago (17th ed.)

Heady, Earl O., i John L. Dillon. Agricultural Production Functions. 5a ed.

Cita MLA (8th ed.)

Heady, Earl O., i John L. Dillon. Agricultural Production Functions. 5a ed.