Gaya APA

NRG4SD fisrt summit Lake Toba, North Sumatra, id 15-17 February 2005, Sustainability through informal sector. (2005). : Medan, Regional Government Network fo Sustainable Development.

Gaya MLA

NRG4SD fisrt summit Lake Toba, North Sumatra, id 15-17 February 2005, Sustainability through informal sector. . : Medan, Regional Government Network fo Sustainable Development, 2005. Text.