Gaya APA
KANHOLM, J. (1998).
ISO 14001 REQUIREMENTS: 61 REQUIREMENTS CHECKKLIST AND COMPLIANCE GUIDE .
Los Angeles:
AQA.Co.
Gaya MLA
KANHOLM, Jack.
"ISO 14001 REQUIREMENTS: 61 REQUIREMENTS CHECKKLIST AND COMPLIANCE GUIDE".
Los Angeles:
AQA.Co,
1998.
Textbook.