D. C. Littlefield
发表
E. R. Brandstetter,
D. C. Littlefield,
M. Villegas,
1996
.
D. C. Littlefield,
2013
.
D. C. Littlefield,
E. C. Gaulden,
A. Seivert,
1964,
American journal of obstetrics and gynecology.
D. C. Littlefield,
2020
.
D. C. Littlefield,
1990
.
D. C. Littlefield,
1997
.
D. C. Littlefield,
2013
.
D. C. Littlefield,
Edmund L. Drago,
1991
.
D. C. Littlefield,
1994,
The Journal of Economic History.
D. C. Littlefield,
1993
.
D. C. Littlefield,
1981
.
D. C. Littlefield,
2012
.
D. C. Littlefield,
2000
.
D. C. Littlefield,
J. Kramer,
V. Fischman,
1967,
JAMA.
D. C. Littlefield,
1989
.
D. C. Littlefield,
J. Kramer,
V. Fischman,
1967
.