ggplot2: Elegant Graphics for Data Analysis (3e) - 12 Other aesthetics
Section - 5 Visualization
10.5 Grouped Aesthetics R for Graduate Students
Plot Snippets - ggplot2 - ugo_r_doc
What is aesthetics and attributes in ggplot's world?
Color, line type, and point shape in ggplot2 diagrams
Differentiation related aesthetics: linetype, size, shape — aes_linetype_size_shape • ggplot2
ggplot2: Elegant Graphics for Data Analysis (3e) - 12 Other aesthetics
aes_linetype_size_shape
ggplot2: Elegant Graphics for Data Analysis (3e) - 12 Other aesthetics