(1980). National agronomy manual: Title 190.
Tohutoru Kātū Chicago (17th ed.)National Agronomy Manual: Title 190. 1980.
Tohutoro MLA (9th ed.)National Agronomy Manual: Title 190. 1980.
Kia tūpato: Kāore pea ēnei kupu hautoa i te ōrite pū 100%.
Tohutoro APA (7th ed.)