Gaya APA
HEWETT, B.
(1992).
GROUPS, GRAPHS 7 GRIDS - GRADE 2-3
.
Amerika:
LEARNING DEVELOPMENT AIDS.
Gaya MLA
HEWETT, BARBARA.
"GROUPS, GRAPHS 7 GRIDS - GRADE 2-3".
Amerika:
LEARNING DEVELOPMENT AIDS,
1992.
Text.