Second Stage of Labor
Are there inequalities in choice of birthing position?
Women's Positions During The Second Stage of Labour: Views of Primary Care Midwives
Effects of pushing techiques in birth on mother and fetus: a randomized study
Effect of fetal position on second stage duration and labor outcome
Position for women during second stage of labor
The "Push" for evidence: Management of the second stage
Best practices in second stage labor care: maternal bearing down and positioning
Classic References:
A descriptive analysis of involuntary bearing-down efforts during the expulsive phase of labor