Παραπομπή σε μορφή APA (7η εκδ.)

Isichei, A. O. (2014). Nitrogen Concentration in the Major Grasses of the Derived and Guinea Savanna Zones of Nigeria in Relation to Season and Site.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Isichei, Augustine O. Nitrogen Concentration in the Major Grasses of the Derived and Guinea Savanna Zones of Nigeria in Relation to Season and Site. 2014.

Παραπομπή σε μορφή MLA (9th εκδ.)

Isichei, Augustine O. Nitrogen Concentration in the Major Grasses of the Derived and Guinea Savanna Zones of Nigeria in Relation to Season and Site. 2014.