APA (7th ed.) Citation

Blackstock, P. W. (1969). The secret road to World War 2 : Soviet versus Western intelligence, 1921 - 1939 / by P.W. Blackstock: Soviet versus Western intelligence, 1921 - 1939. Quadrangle Books.

Chicago Style (17th ed.) Citation

Blackstock, P. W. The Secret Road to World War 2 : Soviet Versus Western Intelligence, 1921 - 1939 / by P.W. Blackstock: Soviet Versus Western Intelligence, 1921 - 1939. Quadrangle Books, 1969.

MLA (9th ed.) Citation

Blackstock, P. W. The Secret Road to World War 2 : Soviet Versus Western Intelligence, 1921 - 1939 / by P.W. Blackstock: Soviet Versus Western Intelligence, 1921 - 1939. Quadrangle Books, 1969.

Warning: These citations may not always be 100% accurate.