Gaya APA

An Introductory Approach : Graph. (1989). : .

Gaya Chicago

An Introductory Approach : Graph. . : , 1989. Text.

Gaya MLA

An Introductory Approach : Graph. . : , 1989. Text.

Gaya Turabian

An Introductory Approach : Graph. : , 1989. Print.