Gaya APA

Physsic today. (1989). New York: World Book.

Gaya Chicago

Physsic today. . New York: World Book, 1989. Text.

Gaya MLA

Physsic today. . New York: World Book, 1989. Text.

Gaya Turabian

Physsic today. New York: World Book, 1989. Print.