APA

Churchill (Winston S.), . (1942). Step By Step 1936-1939. : .

Chicago

Churchill (Winston S.), . 1942. Step By Step 1936-1939. : .

Harvard

Churchill (Winston S.), . (1942). Step By Step 1936-1939. : .

MLA

Churchill (Winston S.), . Step By Step 1936-1939. : . 1942.