APA (7th ed.) Citation

Wu, J., Chen, X., Wu, Q., Wei, N., An, G., Yu, H., & Wang, N. Contrast enhanced ultrasound - a useful method for diagnosing tubal ectopic pregnancy with low level β-HCG. SpringerOpen.

Chicago Style (17th ed.) Citation

Wu, Jingping, Xinyu Chen, Qiong Wu, Na Wei, Guifang An, Hairong Yu, and Ning Wang. Contrast Enhanced Ultrasound - a Useful Method for Diagnosing Tubal Ectopic Pregnancy with Low Level β-HCG. SpringerOpen.

MLA (9th ed.) Citation

Wu, Jingping, et al. Contrast Enhanced Ultrasound - a Useful Method for Diagnosing Tubal Ectopic Pregnancy with Low Level β-HCG. SpringerOpen.