Knapp A.W. Advanced algebra : along with a companion volume basic algebra / A. W. Knapp, 2007 r=on-line. - Текст : электронный.
Knapp A.W. Advanced real analysis : along with a companion volume basic real analysis / A. W. Knapp, 2005 r=on-line
Knapp A.W. Basic real analysis : along with a companion volume advanced real analysis / A. W. Knapp, 2005 r=on-line
Knapp A.W. Basic algebra / A. W. Knapp, 2006 r=on-line. - Текст : электронный.