Abele & Kim (1986)†, Barlow (1977)†, Beinlich & von Hagen (2006)†, Crane (1975)†, Hazlett (1972)†, Heard (1976)†, Heard (1982)†, Heard (1982)†, Novak & Salmon (1974)†, Powers (1975)†, Powers (1975)†, Powers (1977)†, Rosenberg (2019)†, Salmon & Atsaides (1968), Salmon et al. (1979)†, Salmon & Horch (1972)†, Shih et al. (2016)†, Thurman (1979), Thurman (1981)†, von Hagen (1970)†, von Hagen (1975)†, von Hagen (1976)†, von Hagen (1980)†, Williams (1984)†
Entries marked with † represent indirect references to location through citation.