APA (7th ed.) Citation

Walker, G. A. H.. (1987). Astronomical observations: An optical perspective. Cambridge University Press.

Chicago Style (17th ed.) Citation

Walker, Gordon Arthur Hunter. Astronomical Observations: An Optical Perspective. Cambridge: Cambridge University Press, 1987.

MLA (9th ed.) Citation

Walker, Gordon Arthur Hunter. Astronomical Observations: An Optical Perspective. Cambridge University Press, 1987.