APA (7th ed.) Citation

Evans, D., Evans, D. E., & Davies, E. (1975). Some problems in functional analysis.

Chicago Style (17th ed.) Citation

Evans, D., David Emrys Evans, and E. Davies. Some Problems in Functional Analysis. 1975.

MLA (9th ed.) Citation

Evans, D., et al. Some Problems in Functional Analysis. 1975.