PK Gupta. (1999). Handbook of soil,fertilizer and manure. Botanica.
Chicago Edition CitationPK Gupta. Handbook of Soil,fertilizer and Manure. Bikaner: Botanica, 1999.
Cita MLAPK Gupta. Handbook of Soil,fertilizer and Manure. Botanica, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.