APA
Potash and Phosphate Institute of Canada, . (19). Potash : its need & use in modern agriculture. : [s.n.].
Chicago
Potash and Phosphate Institute of Canada, . 19. Potash : its need & use in modern agriculture. : [s.n.].
Harvard
Potash and Phosphate Institute of Canada, . (19). Potash : its need & use in modern agriculture. : [s.n.].
MLA
Potash and Phosphate Institute of Canada, . Potash : its need & use in modern agriculture. : [s.n.]. 19.
