APA (7th ed.) Citation

Choppin, B., & Orr, L. (1976). Aptitude testing at eighteen-plus / by Bruce Choppin and Lea Orr. NFER.

Chicago Style (17th ed.) Citation

Choppin, Bruce, and Lea Orr. Aptitude Testing at Eighteen-plus / by Bruce Choppin and Lea Orr. Windsor: NFER, 1976.

MLA (9th ed.) Citation

Choppin, Bruce, and Lea Orr. Aptitude Testing at Eighteen-plus / by Bruce Choppin and Lea Orr. NFER, 1976.

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