1. Lawrence, B. M. Lemon oil.Essential Oils 1979−1980
2. p 30. (b) Lawrence, B. M.Essential Oils 1988−1991
3. Lawrence, B. M. Lemon oil.Essential Oils 1979−1980; Allured Publishing: Carol Stream, IL, 1981; p 30.
4. (b) Lawrence, B. M.Essential Oils 1988−1991; Allured Publishing: Carol Stream, IL, 1983; pp 61−69.
5. Lawrence, B. M. Lemon oil.Essential Oils 1992−1994