APA

Feilchenfeld E. H., . (1938). The next step: plain man's guide to international principles. Oxford: B. Blackwell.

Chicago

Feilchenfeld Ernst Hermann, . 1938. The next step: plain man's guide to international principles. Oxford: B. Blackwell.

Harvard

Feilchenfeld E. H., . (1938). The next step: plain man's guide to international principles. Oxford: B. Blackwell.

MLA

Feilchenfeld Ernst Hermann, . The next step: plain man's guide to international principles. Oxford: B. Blackwell. 1938.