Cita APA (7th ed.)
Frear, D. E. Agricultural chemistry: A reference text : practical applications of agricultural chemistry. Van Nostrand.
Cita Chicago (17th ed.)
Frear, Donald E.H. Agricultural Chemistry: A Reference Text : Practical Applications of Agricultural Chemistry. Nueva York, EUA: Van Nostrand.
Cita MLA (9th ed.)
Frear, Donald E.H. Agricultural Chemistry: A Reference Text : Practical Applications of Agricultural Chemistry. Van Nostrand.
Atenció: Aquestes cites poden no estar 100% correctes.