Cita APA (7a ed.)

Potash and Phosphate Institute [PPI]. (1923). Better crops with plant food. PPI.

Cita Chicago Style (17a ed.)

Potash and Phosphate Institute [PPI]. Better Crops with Plant Food. Norcross: PPI, 1923.

Cita MLA (8a ed.)

Potash and Phosphate Institute [PPI]. Better Crops with Plant Food. PPI, 1923.