Mendelson, M. J. & Aboud, F. E. (2012) . McGill Friendship Questionnaire Respondent's affection (MFQ-RA) . Measurement Instrument Database for the Social Science.
Mendelson‚ M. J.‚ & Aboud F. E. (1999). Measuring friendship quality in late adolescents and young adults: The McGill Friendship Questionnaires. Canadian Journal of Behavioural Science‚ 31‚ 130–132.
Millington, C. (2019). The Friendship Formula: Add great friends, subtract toxic people and multiply your happiness. Head of Zeus Ltd.