Gaya APA

RUBY BY EXAMPLE. (2007). united states of America: No Starch Press.

Gaya Chicago

RUBY BY EXAMPLE. . united states of America: No Starch Press, 2007. Text.

Gaya MLA

RUBY BY EXAMPLE. . united states of America: No Starch Press, 2007. Text.

Gaya Turabian

RUBY BY EXAMPLE. united states of America: No Starch Press, 2007. Print.