According to Nickell and Dorsey human resources are

Explanation:

Human Resources (According to Nickel and Dorsey): 

• Resources are of two types: human and non-human.
• Human resources were defined by Nickell and Dorsey as the qualities that people possess, including their abilities, knowledge, energy and attitudes.

Thus, according to Nickell and Dorsey human resources are skills, knowledge, and energy.

Additional InformationNon-Human Resources: 

• They defined non-human resources as things like money, time, products, property, and communal facilities that are available to persons outside the family yet are controlled, used, or owned by them.