APA

Welde-Markos W., . (1976). Terrain evaluation for highway engineering land system mapping of the Lake Abaya area. Addis Abeba: Ethiopian Road Authority; Transport and Road Research Laboratory. Joint Road Research Project.JRRP report 6.

Chicago

Welde-Markos W, . 1976. Terrain evaluation for highway engineering land system mapping of the Lake Abaya area. Addis Abeba: Ethiopian Road Authority; Transport and Road Research Laboratory. Joint Road Research Project.JRRP report 6.

Harvard

Welde-Markos W., . (1976). Terrain evaluation for highway engineering land system mapping of the Lake Abaya area. Addis Abeba: Ethiopian Road Authority; Transport and Road Research Laboratory. Joint Road Research Project.JRRP report 6.

MLA

Welde-Markos W, . Terrain evaluation for highway engineering land system mapping of the Lake Abaya area. Addis Abeba: Ethiopian Road Authority; Transport and Road Research Laboratory. Joint Road Research Project.JRRP report 6. 1976.