Παραπομπή APA

Constenla Umaña, M. A., Riley, D., Kennedy, S. H., Rojas Sánchez, C. E., Mora Alfaro, L. E., & Stevens, J. E. B. (1990). Paraquat Behavior in Costa Rican Soils and Residues in Coffee.

Παραπομπή Chicago Style

Constenla Umaña, Manuel Arturo, Dave Riley, Steve H. Kennedy, Carlos Enrique Rojas Sánchez, Luis Enrique Mora Alfaro, και John E. B. Stevens. Paraquat Behavior in Costa Rican Soils and Residues in Coffee. 1990.

Παραπομπή MLA

Constenla Umaña, Manuel Arturo, et al. Paraquat Behavior in Costa Rican Soils and Residues in Coffee. 1990.

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