Pearson and McGraw-Hill backed interactive digital book publisher raises series C funds.

Inkling, a US-based interactive digital book publisher, has raised $16m series C funds, according to a regulatory filing.  Investors have not been disclosed yet, but investors in previous rounds include UK-based publisher Pearson and US-based publisher McGraw-Hill, and so far Inkling has raised at least $32m.

Previously, Inkling raised $17m in a series B round announced in August 2011, led by venture capital firm Tenaya Capital and supported by Pearson Education (a unit of Pearson), Jafco Ventures and Sequoia…