APA

(1990). The Vegetation of the Republic of Yemen (Western Part). Amersfoort: Netherlands Minister for Development Cooperation.

Chicago

1990. The Vegetation of the Republic of Yemen (Western Part). Amersfoort: Netherlands Minister for Development Cooperation.

Harvard

(1990). The Vegetation of the Republic of Yemen (Western Part). Amersfoort: Netherlands Minister for Development Cooperation.

MLA

The Vegetation of the Republic of Yemen (Western Part). Amersfoort: Netherlands Minister for Development Cooperation. 1990.