APA (7th ed.) Citation

Busha, C., & Purcell, R. (1972). The Scientific Investigation of Library Problems.

Chicago Style (17th ed.) Citation

Busha, Charles, and Royal Purcell. The Scientific Investigation of Library Problems. 1972.

MLA (9th ed.) Citation

Busha, Charles, and Royal Purcell. The Scientific Investigation of Library Problems. 1972.

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