APA Style
Skilling, W, T., Richardson, R, S.
(1954).
A Brief Text In Asronomy
.
USA:
A Holt - Dryden Book.
MLA Style
Skilling, William, T.., Richardson, Robert, S..
"A Brief Text In Asronomy".
USA:
A Holt - Dryden Book,
1954.
Text.