Dyfyniad APA

Ryan, J., & Estefan, G. R. (2007). Soil and plant analysis laboratory manual (2nd. ed.). Scientific Publishers.

Dyfyniad Arddull Chicago

Ryan, John, and George Rashid Estefan. Soil and Plant Analysis Laboratory Manual. 2nd. ed. Jodhpur: Scientific Publishers, 2007.

Dyfyniad MLA

Ryan, John, and George Rashid Estefan. Soil and Plant Analysis Laboratory Manual. 2nd. ed. Scientific Publishers, 2007.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.