APA Style
Lopker, John. (2000).
Pictures of personality : guide to the four human natures / John Lopker (1st ed.).
Los Angeles:
Typology.
Chicago Style
Lopker, John.
Pictures of personality : guide to the four human natures / John Lopker.
1st ed.
Los Angeles:
Typology,
2000.
Text.
MLA Style
Lopker, John.
Pictures of personality : guide to the four human natures / John Lopker.
1st ed.
Los Angeles:
Typology,
2000.
Text.
Turabian Style
Lopker, John.
Pictures of personality : guide to the four human natures / John Lopker.
1st ed.
Los Angeles:
Typology,
2000.
Print.