Gaya APA

INTERNASIONAL, N, L, &, A. (1988). REPUBLIC OF INDONESIA DEPARTEMENT OF MINES AND ENERGY DIRECTORATE GENERAL OF MINES . United State: PT. PLN (Persero).

Gaya MLA

INTERNASIONAL, NOEL, LAWRENCE, &, ASOCIATES. "REPUBLIC OF INDONESIA DEPARTEMENT OF MINES AND ENERGY DIRECTORATE GENERAL OF MINES". United State: PT. PLN (Persero), 1988. Textbook.