Free downloadable books on Soft Skills

I working for in the Sales job at the multinational FMCG company, I would like to have some free books for developing soft skills.  Can you suggest me some free book sites for development of soft skills?

There are various sites which will allow you to download books for free.  The following is one of the website that allows you to download their books for free.

Free downloadable eBook

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Free downloading books on Personal Development

I have finished my graduation and now I am working for an Insurance Company, I would like to have some free books for my personal development.  Can you suggest me some free book sites for personal development?

There are various sites which will allow you to download books for free.  The following is one of the website that allows you to download their books for free.

Free downloadable eBooks