APA
Sri Lanka Standards Institution, . (1997). Environmental Management systems specification with guidance for use. Colombo: Sri Lanka Standards Institution.
Chicago
Sri Lanka Standards Institution, . 1997. Environmental Management systems specification with guidance for use. Colombo: Sri Lanka Standards Institution.
Harvard
Sri Lanka Standards Institution, . (1997). Environmental Management systems specification with guidance for use. Colombo: Sri Lanka Standards Institution.
MLA
Sri Lanka Standards Institution, . Environmental Management systems specification with guidance for use. Colombo: Sri Lanka Standards Institution. 1997.
