| Discovery Toys Fall/Winter Catalog, 1986, p. 7, "Stack & Pop", Item 154. |
| Fisher Price Catalog, 1989, pp. 27, "Giant Rock-A-Stack", Item 0740. |
| International Playthings Catalog, 1988, pp. 21, Item KC3330/4. |
| Advertisement for Block Builders, "Tub Blocks", 1987 Geoffrey Inc. |
| "Stack-N-Tumble", No. 2031, 1989 Unimax Catalog. |
| "Clown Bowling", No. 173,559, 1988 Spring-Summer Childcraft catalog. |
| "Building Rabbits", No. EDU-3, 1989-1990 edition of Constructive Playthings catalog. |
| "Chunky Blocks", No. 1203, Holiday 1988 catalog from Toys To Grow On. |
| Stacking Toys illustrated on p. 31 of Holiday 1988 catalog from Toys To Grow On. |
| "Waffle Blocks", No. LT-026, 1989-1990 edition of Constructive Playthings catalog. |