Gaya APA

BIRDSALL, S, S., FLORIN, J. (1999). OUTLINE OF AMERICAN GEOGRAPHY: REGIONAL LANDSCAPES OF THE UNITED STATES . Sidoarjo: .

Gaya MLA

BIRDSALL, STEPHEN, S.., FLORIN, JOHN. "OUTLINE OF AMERICAN GEOGRAPHY: REGIONAL LANDSCAPES OF THE UNITED STATES". Sidoarjo: , 1999. Text.