Partie de site Web
Hedstrom, Margaret. – «Digital preservation : a time bomb for digital libraries». – University of Kentucky. – Lexington : University of Kentucky. {{www.uky.edu}}
Document numérique
Hedstrom, Margaret et al. – Invest to save : report and recommendations of the NSF-DELOS working group on digital archiving and preservation [document numérique]. – Sophia Antipolis : DELOS Network of Excellence on Digital Libraries ; Arlington : National Science Foundation, 2003. – 38 p. – Fichier Acrobat (PDF). {{delos-noe.iei.pi.cnr.it}}
Texte dans un périodique
Hedstrom, Margaret ; Lampe, Clifford. – «Emulation vs. migration : do users care?». – RLG DigiNews [en ligne]. – Vol. 5, no. 6 (Dec. 15, 2001). – N. p. {{www.rlg.org}}