APA-referens

Estefan, G., & Ryan, J. (2012). Soil and plant analysis laboratory manual (2.). Scientific.

Chicago-stil citat

Estefan, George, och Jobhn Ryan. Soil and Plant Analysis Laboratory Manual. 2. India: Scientific, 2012.

MLA-referens

Estefan, George, och Jobhn Ryan. Soil and Plant Analysis Laboratory Manual. 2. Scientific, 2012.