APA

Walker J. C., . (1957). Plant pathology. Estados Unidos: McGRAW-Hill Book Company.

Chicago

Walker John Charles, . 1957. Plant pathology. Estados Unidos: McGRAW-Hill Book Company.

Harvard

Walker J. C., . (1957). Plant pathology. Estados Unidos: McGRAW-Hill Book Company.

MLA

Walker John Charles, . Plant pathology. Estados Unidos: McGRAW-Hill Book Company. 1957.