See Allo

Robbins, Robert R., author

Instructor's manual to accompany Jefferys and Robbins: discovering astronomy

John Wiley & Sons, 1981

Buku Teks

Baker, Robert H., author

D. Van Nostrand, 1964

Buku Teks

Morrison, David, author

Frontiers of astronomy

Saunders College, 1990

Buku Teks

Chapman, Robert D., author

Discovering astronomy

W.H. Freeman, 1978

Buku Teks

Shaffer, Rick, author

Introduction to astronomy

Gramercy Books, 1994

Buku Referensi

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