Here are links to the references mentioned in the footnote of Part 2 of the toolkit:

Reference on page 39 – Tearfund’s guide Doing research ethically explores key principles such as safeguarding, informed consent and inclusion  

Footnote 12 (Page 40) For insights into the type of people who are potentially most  vulnerable and/or excluded, see Section 4.1 'Research with children and adults who are vulnerable' in Tearfund's guide Doing research ethically 
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Footnote 13 (Page 40) CBM's guide Inclusion made easy offers guidance on disability-inclusive development principles

Footnote 15 (Page 41) For more information on our approach to safeguarding, read Tearfund's safeguarding statement

Footnote 16 (Page 41) For advice and ideas about feedback mechanisms, see Tearfund's article 'How to get genuine feedback'

Footnote 18 (Page 80) Here is an example sample-size calculator you can use for determining your survey sample size

Footnote 19 (Page 82) Here is an example random-number generator which you can use to decide who to include in your survey sample