Gaya APA

An Introduction to the world / Sverdrup, Keith A.:Duxbury, Alyn C.:Duxbury, Alison B.. (2000). : Boston, McGraw-Hill.

Gaya MLA

An Introduction to the world / Sverdrup, Keith A.:Duxbury, Alyn C.:Duxbury, Alison B.. 7th ed.. : Boston, McGraw-Hill, 2000. Text.