Gaya APA

Goverment Reference Books 88-89. (1990). : .

Gaya Chicago

Goverment Reference Books 88-89. . : , 1990. Text.

Gaya MLA

Goverment Reference Books 88-89. . : , 1990. Text.

Gaya Turabian

Goverment Reference Books 88-89. : , 1990. Print.