Gaya APA

BubbleFacts : Planet ; earth. (2005). : Miles Kelly.

Gaya Chicago

BubbleFacts : Planet ; earth. . : Miles Kelly, 2005. Text.

Gaya MLA

BubbleFacts : Planet ; earth. . : Miles Kelly, 2005. Text.

Gaya Turabian

BubbleFacts : Planet ; earth. : Miles Kelly, 2005. Print.