Philip Westra
发表
D. G. Westfall,
D. F. Heermann,
Frank B. Peairs,
1999
.
Mark J. VanGessel,
Karen A. Garrett,
Philip Westra,
1995,
Weed Science.
J. V. Stafford,
Lori J. Wiles,
Philip Westra,
1999
.
David A. Mortensen,
Sharon A. Clay,
T. T. Bauman,
1999,
Weed Science.
Kenneth L. Smith,
Clarence J. Swanton,
Eric R. Page,
2012,
Weed Science.
W. Brien Henry,
Patrick F. Byrne,
Peter C. Ellsworth,
2009
.
Donald W. Lybecker,
Frank D. Moore,
Philip Westra,
1995
.
Lori J. Wiles,
Philip Westra,
L. Wiles,
2007
.