GRESIK, P., S.(2006).THE POETRY OF NATURE: WITH A SPECIAL MESSAGE AND POEM FROM DR. SUSILO BAMBANG YUDHOYONO, PRESIDENT OF THE REPUBLIC OF INDONESIA .Jakarta:PT Semen Gresik.
Gaya MLA
GRESIK, PT, SEMEN."THE POETRY OF NATURE: WITH A SPECIAL MESSAGE AND POEM FROM DR. SUSILO BAMBANG YUDHOYONO, PRESIDENT OF THE REPUBLIC OF INDONESIA".Jakarta:PT Semen Gresik,2006.Buku Inti.