Incoming Resources
- 2020 standard catalog of world coins, Thomas Michael, senior editor & market analyst ; Tracy L. Schmidt, editor ; Richard Giedroyc, U.S. market analyst
- Standard catalog of world coins, 2019, Thomas Michael, senior editor & market analyst ; Tracy L. Schmidt, editor ; Kim Frankenhoff, contributing editor ; Richard Diedroyc, U.S. market analyst ; special contributors : Shamik Biswas, Melvyn Kassenoff, Gerhard Schön, Val Tsyrklevich