Gaya APA
Palen, Stacy.E. (2002).
THEORY AND PROBLEMS OF ASTRONOMY .
USA:
McGraw-Hill Companies.
Gaya Chicago
Palen, Stacy.E.
THEORY AND PROBLEMS OF ASTRONOMY.
USA:
McGraw-Hill Companies,
2002.
Text.
Gaya MLA
Palen, Stacy.E.
THEORY AND PROBLEMS OF ASTRONOMY.
USA:
McGraw-Hill Companies,
2002.
Text.
Gaya Turabian
Palen, Stacy.E.
THEORY AND PROBLEMS OF ASTRONOMY.
USA:
McGraw-Hill Companies,
2002.
Print.