R. H. Orr
发表
R. H. Orr,
1974
.
I H Pizer,
R H Orr,
V M Pings,
1968,
Bulletin of the Medical Library Association.
David B. Eastwood,
J. Brooker,
R. H. Orr,
1987,
Journal of Agricultural and Applied Economics.
David B. Eastwood,
J. Brooker,
R. H. Orr,
1987
.