Gaya APA
Abdurrohman, ., Tirtosoekotjo, S. (1996).
Indonesian Coal Statistics: July - September 1996 .
Jakarta:
Ministry of Mines and Energy.
Gaya MLA
Abdurrohman, ., Tirtosoekotjo, Soedjoko.
"Indonesian Coal Statistics: July - September 1996".
Jakarta:
Ministry of Mines and Energy,
1996.
Text.