| Quiggin, Alison Hingston. A SURVEY OF PRIMITIVE
MONEY: THE BEGINNINGS OF CURRENCY. Reprint. London: Spink & Son,
1978. |
| plate 1-3 |
|
| WESTERDIJK, H. Izerwerk van Centraal-
Afrika. (Ironwork of Central Africa) Rotterdam 1975. 154 Pages, 15b/w,
650 line, 3 maps. Text: Dutch |
| p131 #G |
|
| Roberto Ballarini, Ferrie Monete dell'
Africa Equatoriale, Galleria Africa Curio-Milano 1998. 37 Pages
37 |
| p8 |
|
| Opitz, Charles J. ODD AND CURIOUS
MONEY: DESCRIPTIONS AND VALUES. Second Edition. Ocala, FL: First Impressions
Printing, 1991. |
| p65 |
|
| Roberto Ballarini,
Armi
Bianche Dell'Africa Nera (Black Africa's Traditional Arms),
Africa Curio, Milano 1992. 128 Pages. |
| p41 |
| |
| Karl-Ferdinand Schoedler,
Earth and Ore, 2500 Years of African Art in Terra-cotta and Metal.
Panterra Verlag 1997. 369 Pages and maps. |
| p325, #628 |
|
| Primitive Money |
| p17 |
| |
