Spicer, E. E., Pegler, E. C., Bigg, W. W., Wilson, H., & Langton, A. (1952). Spicer & Pegler's practical bookeeping and commercial knowledge (9th ed.). London: H.F.L.

Spicer, Ernest Evan, Ernest Charles Pegler, Walter W. Bigg, H.A.R.J Wilson, and A.E Langton. Spicer & Pegler's Practical Bookeeping and Commercial Knowledge. 9th ed. London: H.F.L, 1952.

Spicer, Ernest Evan, et al. Spicer & Pegler's Practical Bookeeping and Commercial Knowledge. 9th ed. London: H.F.L, 1952.