Sources & photography

These references support background facts and help you check the limits of our practical explanations. The original examples and diagrams are editorial teaching material.

Background reading

Editorial photograph

A barista preparing pour-over coffee by tommao wang on Unsplash, used under the Unsplash License. The photograph illustrates the subject; it is not evidence of our own product testing or a specific outcome.

Original diagrams and exercises

The six three-step diagrams are original vector illustrations created for these guides. Numerical examples demonstrate calculations and assumptions. They are not measurements from an experiment. We do not reproduce reference-site photographs, tables or article text.

Scope and overlap

Coffee brewing, ratios and tasting records. Meal preparation, nutrition claims and general kitchen product rankings are outside this journal.

Reference links checked on 18 October 2026. A source may change after publication. Recheck product or device instructions before applying a general explanation to a specific item.

References for the expanded library

The guides added on 18 October 2026 include original diagrams, exercises and worked examples, with these additional primary references.