Lith, J. M. M. v. (1994). First trimester screening for Down's syndrome. s.n.].
Chicagoスタイル(17版)引用形式Lith, Johannes Marinus Maria van. First Trimester Screening for Down's Syndrome. [S.l.: s.n.], 1994.
MLA(8版)引用形式Lith, Johannes Marinus Maria van. First Trimester Screening for Down's Syndrome. s.n.], 1994.
警告: この引用は必ずしも正確ではありません.