APA (7th ed.) Citation

Walker, M. F., Pike, C. D., & MacGee, J. D. (1976). The colour-magnitude diagram of NGC 5053. [Selbstverl.].

Chicago Style (17th ed.) Citation

Walker, Merle F., C. D. Pike, and James D. MacGee. The Colour-magnitude Diagram of NGC 5053. Mount Hamilton, Calif: [Selbstverl.], 1976.

MLA (9th ed.) Citation

Walker, Merle F., et al. The Colour-magnitude Diagram of NGC 5053. [Selbstverl.], 1976.