Jahn, Gabriele; Schramm, Matthias; Spiller, Achim (1 March 2005). "The Reliability of Certification: Quality Labels as a Consumer Policy Tool". Journal of Consumer Policy. 28 (1): 53–73. doi:10.1007/s10603-004-7298-6. ISSN1573-0700. S2CID154681347.
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Jahn, Gabriele; Schramm, Matthias; Spiller, Achim (1 March 2005). "The Reliability of Certification: Quality Labels as a Consumer Policy Tool". Journal of Consumer Policy. 28 (1): 53–73. doi:10.1007/s10603-004-7298-6. ISSN1573-0700. S2CID154681347.
Barata, João; da Cunha, Paulo Rupino (1 February 2021). "Augmented product information: crafting physical-digital transparency strategies in the materials supply chain". The International Journal of Advanced Manufacturing Technology. 112 (7): 2109–2121. doi:10.1007/s00170-020-06446-9. ISSN1433-3015. S2CID234046442.
Jahn, Gabriele; Schramm, Matthias; Spiller, Achim (1 March 2005). "The Reliability of Certification: Quality Labels as a Consumer Policy Tool". Journal of Consumer Policy. 28 (1): 53–73. doi:10.1007/s10603-004-7298-6. ISSN1573-0700. S2CID154681347.
Barata, João; da Cunha, Paulo Rupino (1 February 2021). "Augmented product information: crafting physical-digital transparency strategies in the materials supply chain". The International Journal of Advanced Manufacturing Technology. 112 (7): 2109–2121. doi:10.1007/s00170-020-06446-9. ISSN1433-3015. S2CID234046442.