Steiner, R. The Philosophy of Spiritual Activity A Modern Philosophy of Life Developed by Scientific Methods.
Cita Chicago (17th ed.)Steiner, Rudolf. The Philosophy of Spiritual Activity A Modern Philosophy of Life Developed by Scientific Methods.
Cita MLA (9th ed.)Steiner, Rudolf. The Philosophy of Spiritual Activity A Modern Philosophy of Life Developed by Scientific Methods.
Atenció: Aquestes cites poden no estar 100% correctes.