APA (7th ed.) Citation

Steiner, R. The Philosophy of Spiritual Activity A Modern Philosophy of Life Developed by Scientific Methods.

Chicago Style (17th ed.) Citation

Steiner, Rudolf. The Philosophy of Spiritual Activity A Modern Philosophy of Life Developed by Scientific Methods.

MLA (9th ed.) Citation

Steiner, Rudolf. The Philosophy of Spiritual Activity A Modern Philosophy of Life Developed by Scientific Methods.

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