I don't have that particular book, but most books with charts will have a key somewhere
, even though it may not be on the pattern page.
For example, / usually means ktog; \ means ssk or skp; o means yo; -means purl on the right side and knit on the wrong side; and an empty box means knit on the right side and purl on the wrong side.
Here is an example, though not all charts use the same symbols.
ETA--Try looking on the abbreviations page at the beginning of the book.