Dyfyniad APA

Alvarado, A., Iturriaga, I., Smyth, J. T., Portuguez, E., & Ureña, J. M. (2008). Residual effect of phosphorus from fertilizer applied to potatoes in Andisols at Juan Viñas, Costa Rica.

Dyfyniad Arddull Chicago

Alvarado, Alfredo, Isabel Iturriaga, Jot T. Smyth, Edward Portuguez, y Juan M. Ureña. Residual Effect of Phosphorus From Fertilizer Applied to Potatoes in Andisols At Juan Viñas, Costa Rica. 2008.

Dyfyniad MLA

Alvarado, Alfredo, et al. Residual Effect of Phosphorus From Fertilizer Applied to Potatoes in Andisols At Juan Viñas, Costa Rica. 2008.

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