APA Style

Sagala, B. D. (1988). Fourth quarterly report and 1987 annual review PT Antam Barisan Mining . Bukittinggi: PT Antam Barisan Mining.

Chicago Style

Sagala, B. D. Fourth quarterly report and 1987 annual review PT Antam Barisan Mining. Bukittinggi: PT Antam Barisan Mining, 1988. Text.

MLA Style

Sagala, B. D. Fourth quarterly report and 1987 annual review PT Antam Barisan Mining. Bukittinggi: PT Antam Barisan Mining, 1988. Text.

Turabian Style

Sagala, B. D. Fourth quarterly report and 1987 annual review PT Antam Barisan Mining. Bukittinggi: PT Antam Barisan Mining, 1988. Print.