Gaya APA
Heylings, .
(1987).
Graded examples in mathematics - Algebra
(
1)
.
England:
Schofield & Sims Limited.
Gaya MLA
Heylings, .
"Graded examples in mathematics - Algebra".
1
England:
Schofield & Sims Limited,
1987.
Buku Analog.