Cita APA

Okalebo, J. R., Gathua, K. W., & Woomer, P. L. (1993). Laboratory methods of soil and plant analysis: A working manual. Nairobi, Kenya: Tropical Soil Biology and Fertility Programme.

Citación estilo Chicago

Okalebo, J. Robert, Kenneth W. Gathua, y Paul L. Woomer. Laboratory Methods of Soil and Plant Analysis: A Working Manual. Nairobi, Kenya: Tropical Soil Biology and Fertility Programme, 1993.

Cita MLA

Okalebo, J. Robert, Kenneth W. Gathua, y Paul L. Woomer. Laboratory Methods of Soil and Plant Analysis: A Working Manual. Nairobi, Kenya: Tropical Soil Biology and Fertility Programme, 1993.