GDP

Bureau of Economic Analysis

International Financial Statistics Yearbook

- in Reference HG 61 .I57

S&P Statistical Service

- in Reference @  HG4915 .S68

Statistical Abstract of the United States

- also a print copy in Reference @ HA196.A2

- GDP and also GNP & the relationship between GNP & GDP

GDP Forecasting

GMID Global Market Information Database

- a Euromonitor database.  Go in through the "Countries" heading and select economic indicators