APA

Goodchild M., Association for Computing Machinery, ACM Special Interest Group on Computer Graphics and Interactive Techniques & ACM Special Interest Group on Spatial Information. (2012). Proceedings of the 1st ACM SIGSPATIAL International Workshop on Crowdsourced and Volunteered Geographic Information. New York, NY: ACM.

Chicago

Goodchild Mike, Association for Computing Machinery, ACM Special Interest Group on Computer Graphics and Interactive Techniques and ACM Special Interest Group on Spatial Information. 2012. Proceedings of the 1st ACM SIGSPATIAL International Workshop on Crowdsourced and Volunteered Geographic Information. New York, NY: ACM.

Harvard

Goodchild M., Association for Computing Machinery, ACM Special Interest Group on Computer Graphics and Interactive Techniques and ACM Special Interest Group on Spatial Information. (2012). Proceedings of the 1st ACM SIGSPATIAL International Workshop on Crowdsourced and Volunteered Geographic Information. New York, NY: ACM.

MLA

Goodchild Mike, Association for Computing Machinery, ACM Special Interest Group on Computer Graphics and Interactive Techniques and ACM Special Interest Group on Spatial Information. Proceedings of the 1st ACM SIGSPATIAL International Workshop on Crowdsourced and Volunteered Geographic Information. New York, NY: ACM. 2012.