Numismatic Guaranty Company (Indonesian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Numismatic Guaranty Company" in Indonesian language version.

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archive.org

Travers, Scott A. (2010). The Coin Collector's Survival Manual (edisi ke-7). New York, NY: House of Collectibles. hlm. 432. ISBN 978-0375723391.

Starck, Jeff. "NGC grading room confidential". coinworld.com. Coin World. Diakses tanggal 15 September 2015.
"NGC expands 'plus' designation to world coins". coinworld.com. Coin World. Diakses tanggal 15 September 2015.

"Numismatic Guaranty Corporation Is Now Numismatic Guaranty Company". www.ngccoin.com (dalam bahasa Inggris). 15 Sepetember 2021. Diakses tanggal 8 Mei 2023.
"About NGC". www.ngccoin.com. NGC. Diakses tanggal 25 Februari 2022.
"Introduction to NGC". www.ngccoin.com. NGC. Diakses tanggal 15 Juni 2016.
"Global Locations". www.ngccoin.com. NGC. Diakses tanggal 9 Desember 2017.
"THE NGC COIN GRADING SYSTEM". www.ngccoin.com. NGC. Diakses tanggal 12 Juli 2016.
"NGC Holders". www.ngccoin.com. NGC. Diakses tanggal 11 Juli 2019.
"NGC Unveils New Holder Design". ngccoin.com. NGC. Diakses tanggal 12 Juli 2016.
"SCRATCH-RESISTANT COIN HOLDER". www.ngccoin.com. NGC. Diakses tanggal 12 Juli 2016.
"NGC Research". www.ngccoin.com. NGC. Diakses tanggal 12 Juli 2016.

"NGC is the official grading service of PNG". www.pngdealers.org. Professional Numismatists Guild. Diarsipkan dari versi asli tanggal 2016-06-27. Diakses tanggal 12 Juli 2016.
"PNG, ICTA Announce Results of 2006 Grading Services Survey". www.pngdealers.org. PNG. Diarsipkan dari versi asli tanggal 21 September 2015. Diakses tanggal 5 Agustus 2015.

"NGC is the official grading service of PNG". www.pngdealers.org. Professional Numismatists Guild. Diarsipkan dari versi asli tanggal 2016-06-27. Diakses tanggal 12 Juli 2016.
"PNG, ICTA Announce Results of 2006 Grading Services Survey". www.pngdealers.org. PNG. Diarsipkan dari versi asli tanggal 21 September 2015. Diakses tanggal 5 Agustus 2015.