Gaya APA

Annual report 1998. (1998). Yogyakarta: UGM.

Gaya Chicago

Annual report 1998. . Yogyakarta: UGM, 1998. .

Gaya MLA

Annual report 1998. . Yogyakarta: UGM, 1998. .

Gaya Turabian

Annual report 1998. Yogyakarta: UGM, 1998. .