| Dunn, Richard |
| British globes up to 1850 : a provisional inventory / Richard Dunn and Helen Wallis. |
9.2.27 Corrispondenti W
| 9.2.27 Corrispondenti W, [195-]-1961 |
| In: Carteggio (Direzione Corsini). 1924-1961 |
| Crinò, Anna Maria |
| New researches on the molyneus globes / Anna Maria Crinò and Helen Wallis. |
| Wien : [s.n.], 1987. |
| Wallis, Helen, 1924-1995 |
| The resurrection of Coronelli's great globes / by Helen Wallis. |
| Wallis, Helen, 1924-1995 |
| The role of the painter in Renaissance marine cartography / Helen Wallis. |
| In: Imago et mensura mundi. Congresso internazionale di storia della cartografia (9 : 1981 :ciisa, Fiirenze, Roma) p. 515-523 |
| Tooley, Ronald Vere |
| Tooley's dictionary of mapmakers / compiled by R. V. Tooley ; with a preface by H. Wallis. |
| New York : Alan R. Liss, c1979. |
| Wallis, Helen, 1924-1995 |
| The use of globes by land and sea / Helen Wallis. |