APA Style

Zeleny, Robert O.. (1990). The World Book Encyclopedia - Vol 15 . : .

Chicago Style

Zeleny, Robert O.. The World Book Encyclopedia - Vol 15. : , 1990. Teks.

MLA Style

Zeleny, Robert O.. The World Book Encyclopedia - Vol 15. : , 1990. Teks.

Turabian Style

Zeleny, Robert O.. The World Book Encyclopedia - Vol 15. : , 1990. Teks.