APA (7th ed.) Citation

Roosevelt, T. (1911). The strenuous life: Essays and addresses. Nelson.

Chicago Style (17th ed.) Citation

Roosevelt, Theodore. The Strenuous Life: Essays and Addresses. London [u.a.]: Nelson, 1911.

MLA (9th ed.) Citation

Roosevelt, Theodore. The Strenuous Life: Essays and Addresses. Nelson, 1911.

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