Gaya APA
CUsens, A, R., santathyadaporn, S. (1996).
design charts for helical stairs with fixed supports .
LONDON:
congrete publications.
Gaya MLA
CUsens, A., R.., santathyadaporn, Sakda.
"design charts for helical stairs with fixed supports".
LONDON:
congrete publications,
1996.
Text.