APA-ийн эшлэл(7 дахь хэвлэлт)

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.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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.

MLA -ийн эшлэл (9 дэх хэвлэлт)

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.