WHO. (1996). Obstructed labour module. education material for teachers of midwifery. WHO.
芝加哥风格引文WHO. Obstructed Labour Module. Education Material for Teachers of Midwifery. WHO, 1996.
MLA引文WHO. Obstructed Labour Module. Education Material for Teachers of Midwifery. WHO, 1996.
警告：这些引文格式不一定是100％准确.