Cita APA (7a ed.)

BROWN, L. R. (1995). Tanda-tanda Zaman Era 90-an / Lester R. Brown. Obor.

Cita Chicago Style (17a ed.)

BROWN, Lestern R. Tanda-tanda Zaman Era 90-an / Lester R. Brown. Obor, 1995.

Cita MLA (8a ed.)

BROWN, Lestern R. Tanda-tanda Zaman Era 90-an / Lester R. Brown. Obor, 1995.