421
by Mankiw, N. Gregory
Published 2001
422
423
424
by Cho, George, 1946-
Published 1990
425
by Krishnan, Arjunan.
Published 1998
426
by Gujarati, Damodar N.
Published 2003
427
by Burnett, Brian
Published 2001
428
Published 1999
429
by Harris, Marvin
Published 2000
430
Published 2002
431
by Bennett, W. Lance.
Published 2001
432
by Teoh Boon Kee
Published 2002
433
by Haugen, Robert A.
Published 1997
434
435
436
by Woon,Walter C.M.
Published 2002
437
438
by Clarke, David
Published 1996
439
440
by Ford, H.A.J.
Published 1997