6. BIBLIOGRAPHY
- Burkitt . 1928 . “South Africa's Past in Stone and Paint,”
- Dart . 1929 . (a), “Phallic Objects in Southern Africa,” . S. Afr. Journ. Sci. , xxvi : 553 – 562 . December
- Dart . 1931 . (b), “Rock Engravings in Southern Africa, and some Clues to their Significance and Age,” . S. Afr. Journ. Sci. , xxviii : 475 – 486 . November
- Dart . 1932 . “ (c), “Further Data on the Origin and Phallic Character of Conical Perforated Stones,” . In S. Afr. Journ. Sci 731 – 741 . October
- Dart and Del Grande . 1931 . “The Ancient Iron-smelting Cavern at Mumbwa,” . Trans. Roy. Soc. S. Afr. , xix pt. iv
- Drennan . 1930 . “A Ground Stone-Axe from a Cape Rock-Shelter,” . Trans. Roy. Soc. S. Afr. , xix pt. i
- Goodwin . 1930 . “Some Ground Axes from Rhodesia and the Transvaal,” . Trans. Roy. Soc. S. Afr. , xix pt. i
- Goodwin and Van Riet Lowe . 1929 . “The Stone Age Cultures of South Africa,” . Annals of the South African Museum, vol. , xxvii