APA Style
Henkel, Mary, Research and Education Association. ().
The economics problem solver .
:
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Chicago Style
Henkel, Mary, Research and Education Association.
The economics problem solver.
:
,
.
.
MLA Style
Henkel, Mary, Research and Education Association.
The economics problem solver.
:
,
.
.
Turabian Style
Henkel, Mary, Research and Education Association.
The economics problem solver.
:
,
.
.