APA

Churchill (Winston S), . (1948). Step By Step 1936-1939. : .

Chicago

Churchill (Winston S), . 1948. Step By Step 1936-1939. : .

Harvard

Churchill (Winston S), . (1948). Step By Step 1936-1939. : .

MLA

Churchill (Winston S), . Step By Step 1936-1939. : . 1948.