APA Edition Citation

Choppin, B., & Orr, L. (1976). Aptitude testing at eighteen plus.

Chicago Edition Citation

Choppin, Bruce, and Lea Orr. Aptitude Testing at Eighteen Plus. 1976.

MLA Edition Citation

Choppin, Bruce, and Lea Orr. Aptitude Testing at Eighteen Plus. 1976.

Warning: These citations may not always be 100% accurate.