Παραπομπή APA

Bru?ck, M. T. 1., & Gingerich, O. (1990). Exercises in practical astronomy using photographs: With solutions. Bristol Philadelphia: A. Hilger.

Παραπομπή Chicago Style

Bru?ck, M. T. 1925-, and Owen Gingerich. Exercises in Practical Astronomy Using Photographs: With Solutions. Bristol Philadelphia: A. Hilger, 1990.

Παραπομπή MLA

Bru?ck, M. T. 1925-, and Owen Gingerich. Exercises in Practical Astronomy Using Photographs: With Solutions. Bristol Philadelphia: A. Hilger, 1990.

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