Gaya APA
Sigit, S. (1971).
Foreign Participation in Mining in Indonesia 1967 - 1970 (Tahun 1971).
Jakarta:
MINISTRY OF MINES AND ENERGY.
Gaya MLA
Sigit, Soetarjo.
"Foreign Participation in Mining in Indonesia 1967 - 1970".
Tahun 1971
Jakarta:
MINISTRY OF MINES AND ENERGY,
1971.
Text.