APA

(1998). Standard methods for the examination of water and wastewater. : American Public Health Association, American Water Works Association, Water Enviorenment Federation.

Chicago

1998. Standard methods for the examination of water and wastewater. : American Public Health Association, American Water Works Association, Water Enviorenment Federation.

Harvard

(1998). Standard methods for the examination of water and wastewater. : American Public Health Association, American Water Works Association, Water Enviorenment Federation.

MLA

Standard methods for the examination of water and wastewater. : American Public Health Association, American Water Works Association, Water Enviorenment Federation. 1998.