Cita APA (7th ed.)

COVEY STEPHEN R. (1997). SEVEN HABITS OF HIGHLY EFFECTIVE PEOPLE. SIMON & SCHUSTER INC.

Cita Chicago (17th ed.)

COVEY STEPHEN R. SEVEN HABITS OF HIGHLY EFFECTIVE PEOPLE. U.K: SIMON & SCHUSTER INC, 1997.

Cita MLA (9th ed.)

COVEY STEPHEN R. SEVEN HABITS OF HIGHLY EFFECTIVE PEOPLE. SIMON & SCHUSTER INC, 1997.