South Africa’s Radical Tradition, a documentary history, Volume Two 1943 - 1964, by Allison Drew
… 8 January 1948 Document 38 - “I.B. Tabata, The Boycott as Weapon of Struggle 9, June 1952 Document 39 - “Walter Sisulu, "Boycott as a Political Weapon", Liberation, 23, February 1957 …