| King Leopold's Congo : Aspects of Development of Race Relations in the Congo Independent State [1974] |
1974 |
| King Leopold's Congo : Aspects of Development of Race Relations in the Congo Independent State |
1962 |
| The Belgian Congo. With an Additionnal Chapter by Marjory Taylor (2d edition) |
1961 |
| The Belgian Congo : some recent changes [1960] |
1960 |
 English-Speaking Missions in the Congo Independent state (1878-1908) |
1959 |
| King Leopold II and the Attitude of English and American Catholics towards the anti-Congolese Campaign |
1957-06 |
