APA citiranje

Barber, R. (2016). Research and extension to promote the sustainability of the basic gratns system in the slopes in the area of El Salvador.

Citación estilo Chicago

Barber, Richard. Research and Extension to Promote the Sustainability of the Basic Gratns System in the Slopes in the Area of El Salvador. 2016.

MLA citiranje

Barber, Richard. Research and Extension to Promote the Sustainability of the Basic Gratns System in the Slopes in the Area of El Salvador. 2016.