Ho Peg Leng. (2017). Science Activity Book 1. Marshall Cavendish.
Chicago-čujuhus (17. p.)Ho Peg Leng. Science Activity Book 1. Singapore: Marshall Cavendish, 2017.
MLA-čujuhus (9. p.)Ho Peg Leng. Science Activity Book 1. Marshall Cavendish, 2017.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.