APA (7th ed.) Citation

Liu, X., & Liu, Q. Energy Transformation in Gravitational Fields: A New Perspective on Four-Velocity. World Scientific Publishing.

Chicago Style (17th ed.) Citation

Liu, Xiaoling, and Qianyu Liu. Energy Transformation in Gravitational Fields: A New Perspective on Four-Velocity. World Scientific Publishing.

MLA (9th ed.) Citation

Liu, Xiaoling, and Qianyu Liu. Energy Transformation in Gravitational Fields: A New Perspective on Four-Velocity. World Scientific Publishing.

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