Cita APA (7th ed.)

Crawford, D. H. An investigation of age-grade trends in understanding the field axioms. University Microfilms.

Cita Chicago (17th ed.)

Crawford, Douglas Houston. An Investigation of Age-grade Trends in Understanding the Field Axioms. Ann Arbor, Mich: University Microfilms.

Cita MLA (9th ed.)

Crawford, Douglas Houston. An Investigation of Age-grade Trends in Understanding the Field Axioms. University Microfilms.