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| Quiggin, Alison Hingston. A SURVEY OF PRIMITIVE MONEY: THE BEGINNINGS OF CURRENCY. Reprint. London: Spink & Son, 1978. |
| p65 |
| Peter Westerdijk, Curator. African Metal Implements Weapons, Tools, and Regalia. Collection of Frederick & Claire Mebel, Hillwood Art Gallery , Long Island University, New York 1984. 48 Pages. |
| p31 |
| WESTERDIJK, H. Izerwerk van Centraal- Afrika. (Ironwork of Central Africa) Rotterdam 1975. 154 Pages, 15b/w, 650 line, 3 maps. Text: Dutch |
| p134#I |
| Opitz, Charles J. ODD AND CURIOUS MONEY: DESCRIPTIONS AND VALUES. Second Edition. Ocala, FL: First Impressions Printing, 1991. |
| p102 |
| Roberto Ballarini, Armi Bianche Dell'Africa Nera (Black Africa's Traditional Arms), Africa Curio, Milano 1992. 128 Pages. |
| p120 |
| Banque De Kinshasa Exercice 1978 |
| p13 |
| Karl-Ferdinand Schoedler, Earth and Ore, 2500 Years of African Art in Terra-cotta and Metal. Panterra Verlag 1997. 369 Pages and maps. |
| p327 #633 |
| German Museum Collection - |
| p? |
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